diff --git a/.gitignore b/.gitignore
index 13d30627ee..088d077e44 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,9 @@
 /build
-/cache
 /shims
 /version
 /versions
 /sources
+/cache
+/libexec/*.dylib
+/src/Makefile
+/src/*.o
diff --git a/.travis.yml b/.travis.yml
index 62059e3b92..fdb3e762c9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
-install: git clone --depth 1 https://github.com/sstephenson/bats.git
-script: script/test
+install: git clone https://github.com/sstephenson/bats.git
+script: PATH="./bats/bin:$PATH" test/run && ( cd plugins/python-build bats ${CI:+--tap} test )
 language: c
-notifications:
-  email:
-    on_success: never
+env:
+  - PYENV_NATIVE_EXT=
+  - PYENV_NATIVE_EXT=1
diff --git a/libexec/pyenv b/libexec/pyenv
index e294f638ac..3cf004e61d 100755
--- a/libexec/pyenv
+++ b/libexec/pyenv
@@ -12,6 +12,16 @@ if [ -n "$PYENV_DEBUG" ]; then
   set -x
 fi
 
+if enable -f "${0%/*}"/../libexec/pyenv-realpath.dylib realpath 2>/dev/null; then
+  abs_dirname() {
+    local path="$(realpath "$1")"
+    echo "${path%/*}"
+  }
+else
+  if [ -n "$PYENV_NATIVE_EXT" ]; then
+    echo "pyenv: failed to load \`realpath' builtin" >&2
+    exit 1
+  fi
 READLINK=$(type -p greadlink readlink | head -1)
 if [ -z "$READLINK" ]; then
   echo "pyenv: cannot find readlink - are you missing GNU coreutils?" >&2
@@ -37,6 +47,7 @@ abs_dirname() {
   pwd
   cd "$cwd"
 }
+fi
 
 if [ -z "${PYENV_ROOT}" ]; then
   PYENV_ROOT="${HOME}/.pyenv"
@@ -62,15 +73,20 @@ shopt -s nullglob
 
 bin_path="$(abs_dirname "$0")"
 for plugin_bin in "${PYENV_ROOT}/plugins/"*/bin; do
-  bin_path="${bin_path}:${plugin_bin}"
+  PATH="${plugin_bin}:${PATH}"
 done
 export PATH="${bin_path}:${PATH}"
 
-hook_path="${PYENV_HOOK_PATH}:${PYENV_ROOT}/pyenv.d:/usr/local/etc/pyenv.d:/etc/pyenv.d:/usr/lib/pyenv/hooks"
+PYENV_HOOK_PATH="${PYENV_HOOK_PATH}:${PYENV_ROOT}/pyenv.d"
+if [ "${bin_path%/*}" != "$PYENV_ROOT" ]; then
+  # Add pyenv's own `pyenv.d` unless pyenv was cloned to PYENV_ROOT
+  PYENV_HOOK_PATH="${PYENV_HOOK_PATH}:${bin_path%/*}/pyenv.d"
+fi
+PYENV_HOOK_PATH="${PYENV_HOOK_PATH}:/usr/local/etc/pyenv.d:/etc/pyenv.d:/usr/lib/pyenv/hooks"
 for plugin_hook in "${PYENV_ROOT}/plugins/"*/etc/pyenv.d; do
-  hook_path="${hook_path}:${plugin_hook}"
+  PYENV_HOOK_PATH="${PYENV_HOOK_PATH}:${plugin_hook}"
 done
-export PYENV_HOOK_PATH="$hook_path"
+export PYENV_HOOK_PATH
 
 shopt -u nullglob
 
diff --git a/libexec/pyenv-exec b/libexec/pyenv-exec
index 728e8f69b9..dcdce7145d 100755
--- a/libexec/pyenv-exec
+++ b/libexec/pyenv-exec
@@ -18,7 +18,7 @@ set -e
 
 # Provide pyenv completions
 if [ "$1" = "--complete" ]; then
-  exec pyenv shims --short
+  exec pyenv-shims --short
 fi
 
 PYENV_VERSION="$(pyenv-version-name)"
diff --git a/libexec/pyenv-hooks b/libexec/pyenv-hooks
index bd6572aef1..fc4b2c0633 100755
--- a/libexec/pyenv-hooks
+++ b/libexec/pyenv-hooks
@@ -19,6 +19,11 @@ if [ -z "$PYENV_COMMAND" ]; then
   exit 1
 fi
 
+if ! enable -f "${BASH_SOURCE%/*}"/pyenv-realpath.dylib realpath 2>/dev/null; then
+  if [ -n "$PYENV_NATIVE_EXT" ]; then
+    echo "pyenv: failed to load \`realpath' builtin" >&2
+    exit 1
+  fi
 READLINK=$(type -p greadlink readlink | head -1)
 if [ -z "$READLINK" ]; then
   echo "pyenv: cannot find readlink - are you missing GNU coreutils?" >&2
@@ -42,13 +47,14 @@ realpath() {
   echo "$(pwd)/$name"
   cd "$cwd"
 }
+fi
 
 IFS=: hook_paths=($PYENV_HOOK_PATH)
 
 shopt -s nullglob
 for path in "${hook_paths[@]}"; do
   for script in "$path/$PYENV_COMMAND"/*.bash; do
-    echo $(realpath $script)
+    realpath "$script"
   done
 done
 shopt -u nullglob
diff --git a/libexec/pyenv-init b/libexec/pyenv-init
index c99ba4450d..a8712085de 100755
--- a/libexec/pyenv-init
+++ b/libexec/pyenv-init
@@ -28,31 +28,7 @@ if [ -z "$shell" ]; then
   shell="$(basename "${shell:-$SHELL}")"
 fi
 
-READLINK=$(type -p greadlink readlink | head -1)
-if [ -z "$READLINK" ]; then
-  echo "pyenv: cannot find readlink - are you missing GNU coreutils?" >&2
-  exit 1
-fi
-
-resolve_link() {
-  $READLINK "$1"
-}
-
-abs_dirname() {
-  local cwd="$(pwd)"
-  local path="$1"
-
-  while [ -n "$path" ]; do
-    cd "${path%/*}"
-    local name="${path##*/}"
-    path="$(resolve_link "$name" || true)"
-  done
-
-  pwd
-  cd "$cwd"
-}
-
-root="$(abs_dirname "$0")/.."
+root="${0%/*}/.."
 
 if [ -z "$print" ]; then
   case "$shell" in
@@ -92,22 +68,13 @@ fi
 
 mkdir -p "${PYENV_ROOT}/"{shims,versions}
 
-if [[ ":${PATH}:" != *:"${PYENV_ROOT}/shims":* ]]; then
-  case "$shell" in
-  fish )
-    echo "setenv PATH '${PYENV_ROOT}/shims' \$PATH"
-  ;;
-  * )
-    echo 'export PATH="'${PYENV_ROOT}'/shims:${PATH}"'
-  ;;
-  esac
-fi
-
 case "$shell" in
 fish )
+  echo "setenv PATH '${PYENV_ROOT}/shims' \$PATH"
   echo "setenv PYENV_SHELL $shell"
 ;;
 * )
+  echo 'export PATH="'${PYENV_ROOT}'/shims:${PATH}"'
   echo "export PYENV_SHELL=$shell"
 ;;
 esac
diff --git a/libexec/pyenv-rehash b/libexec/pyenv-rehash
index 5b758ae5d9..c266b1bf21 100755
--- a/libexec/pyenv-rehash
+++ b/libexec/pyenv-rehash
@@ -70,49 +70,47 @@ SH
 # of the first shim in the shims directory, assume pyenv has been
 # upgraded and the existing shims need to be removed.
 remove_outdated_shims() {
-  for shim in *; do
+  local shim
+  for shim in "$SHIM_PATH"/*; do
     if ! diff "$PROTOTYPE_SHIM_PATH" "$shim" >/dev/null 2>&1; then
-      for shim in *; do rm -f "$shim"; done
+      rm -f "$SHIM_PATH"/*
     fi
     break
   done
 }
 
+# List basenames of executables for every Python version
+list_executable_names() {
+  local file
+  for file in "$PYENV_ROOT"/versions/*/bin/*; do
+    echo "${file##*/}"
+  done
+}
+
 # The basename of each argument passed to `make_shims` will be
 # registered for installation as a shim. In this way, plugins may call
 # `make_shims` with a glob to register many shims at once.
 make_shims() {
-  local shims=("$@")
-
-  for file in "${shims[@]}"; do
-    local shim="${file##*/}"
+  local file shim
+  for file; do
+    shim="${file##*/}"
     register_shim "$shim"
   done
 }
 
-# Create an empty array for the list of registered shims and an empty
-# string to use as a search index.
-registered_shims=()
-registered_shims_index=""
+registered_shims=" "
 
-# We will keep track of shims registered for installation with the
-# global `registered_shims` array and with a global search index
-# string. The array will let us iterate over all registered shims. The
-# index string will let us quickly check whether a shim with the given
-# name has been registered or not.
+# Registers the name of a shim to be generated.
 register_shim() {
-  local shim="$@"
-  registered_shims["${#registered_shims[@]}"]="$shim"
-  registered_shims_index="$registered_shims_index/$shim/"
+  registered_shims="${registered_shims}${1} "
 }
 
-# To install all the registered shims, we iterate over the
-# `registered_shims` array and create a link if one does not already
-# exist.
+# Install all the shims registered via `make_shims` or `register_shim` directly.
 install_registered_shims() {
-  local shim
-  for shim in "${registered_shims[@]}"; do
-    [ -e "$shim" ] || ln -f "$PROTOTYPE_SHIM_PATH" "$shim"
+  local shim file
+  for shim in $registered_shims; do
+    file="${SHIM_PATH}/${shim}"
+    [ -e "$file" ] || ln -f "$PROTOTYPE_SHIM_PATH" "$file"
   done
 }
 
@@ -122,26 +120,21 @@ install_registered_shims() {
 # removed.
 remove_stale_shims() {
   local shim
-  for shim in *; do
-    if [[ "$registered_shims_index" != *"/$shim/"* ]]; then
+  for shim in "$SHIM_PATH"/*; do
+    if [[ "$registered_shims" != *" ${shim##*/} "* ]]; then
       rm -f "$shim"
     fi
   done
 }
 
-
-# Change to the shims directory.
-cd "$SHIM_PATH"
 shopt -s nullglob
 
 # Create the prototype shim, then register shims for all known
 # executables.
 create_prototype_shim
 remove_outdated_shims
-make_shims ../versions/*/bin/*
+make_shims $(list_executable_names | sort -u)
 
-# Restore the previous working directory.
-cd "$OLDPWD"
 
 # Allow plugins to register shims.
 OLDIFS="$IFS"
@@ -152,8 +145,5 @@ for script in "${scripts[@]}"; do
   source "$script"
 done
 
-# Change back to the shims directory to install the registered shims
-# and remove stale shims.
-cd "$SHIM_PATH"
 install_registered_shims
 remove_stale_shims
diff --git a/libexec/pyenv-whence b/libexec/pyenv-whence
index 101c5e2761..d551e567e7 100755
--- a/libexec/pyenv-whence
+++ b/libexec/pyenv-whence
@@ -8,7 +8,7 @@ set -e
 # Provide pyenv completions
 if [ "$1" = "--complete" ]; then
   echo --path
-  exec pyenv shims --short
+  exec pyenv-shims --short
 fi
 
 if [ "$1" = "--path" ]; then
diff --git a/libexec/pyenv-which b/libexec/pyenv-which
index 65dad24134..675c70fe0c 100755
--- a/libexec/pyenv-which
+++ b/libexec/pyenv-which
@@ -12,7 +12,7 @@ set -e
 
 # Provide pyenv completions
 if [ "$1" = "--complete" ]; then
-  exec pyenv shims --short
+  exec pyenv-shims --short
 fi
 
 remove_from_path() {
diff --git a/script/test b/script/test
deleted file mode 100755
index 2764644d56..0000000000
--- a/script/test
+++ /dev/null
@@ -1,20 +0,0 @@
-#!/usr/bin/env bash
-set -e
-
-[ -d ./bats/bin ] && export PATH="$(pwd)"/bats/bin:"$PATH"
-
-STATUS=0
-bats -t test && ( cd plugins/python-build && bats -t test ) || STATUS="$?"
-
-#if [ "$TRAVIS_PULL_REQUEST" != "false" ] && [ -z "$TRAVIS_COMMIT_RANGE" ]; then
-#  first_sha="$(curl -fsSL https://github.com/${TRAVIS_REPO_SLUG}/pull/${TRAVIS_PULL_REQUEST}.patch | head -1 | awk '{print $2}')"
-#  export TRAVIS_COMMIT_RANGE="${first_sha}^..${TRAVIS_COMMIT}"
-#fi
-
-#if [ "$TRAVIS_SECURE_ENV_VARS" = "true" ]; then
-#  ./script/mirror update "$TRAVIS_COMMIT_RANGE"
-#elif [ "$TRAVIS_PULL_REQUEST" != "false" ]; then
-#  ./script/mirror verify "$TRAVIS_COMMIT_RANGE"
-#fi
-
-exit "$STATUS"
diff --git a/src/Makefile.in b/src/Makefile.in
new file mode 100644
index 0000000000..4c203e729a
--- /dev/null
+++ b/src/Makefile.in
@@ -0,0 +1,25 @@
+CC = @CC@
+
+CFLAGS = @CFLAGS@
+LOCAL_CFLAGS = @LOCAL_CFLAGS@
+DEFS = @DEFS@
+LOCAL_DEFS = @LOCAL_DEFS@
+
+CCFLAGS = $(DEFS) $(LOCAL_DEFS) $(LOCAL_CFLAGS) $(CFLAGS)
+
+SHOBJ_CC = @SHOBJ_CC@
+SHOBJ_CFLAGS = @SHOBJ_CFLAGS@
+SHOBJ_LD = @SHOBJ_LD@
+SHOBJ_LDFLAGS = @SHOBJ_LDFLAGS@
+SHOBJ_XLDFLAGS = @SHOBJ_XLDFLAGS@
+SHOBJ_LIBS = @SHOBJ_LIBS@
+SHOBJ_STATUS = @SHOBJ_STATUS@
+
+.c.o:
+	$(SHOBJ_CC) $(SHOBJ_CFLAGS) $(CCFLAGS) -c -o $@ $<
+
+../libexec/pyenv-realpath.dylib: realpath.o
+	$(SHOBJ_LD) $(SHOBJ_LDFLAGS) $(SHOBJ_XLDFLAGS) -o $@ realpath.o $(SHOBJ_LIBS)
+
+clean:
+	rm -f *.o ../libexec/*.dylib
diff --git a/src/bash.h b/src/bash.h
new file mode 100644
index 0000000000..1b29fd05ca
--- /dev/null
+++ b/src/bash.h
@@ -0,0 +1,31 @@
+#ifndef __BASH_H__
+#define __BASH_H__
+
+#define EXECUTION_SUCCESS 0
+#define EXECUTION_FAILURE 1
+#define EX_USAGE 258
+
+#define BUILTIN_ENABLED 1
+
+typedef struct word_desc {
+  char *word;
+  int flags;
+} WORD_DESC;
+
+typedef struct word_list {
+  struct word_list *next;
+  WORD_DESC *word;
+} WORD_LIST;
+
+typedef int sh_builtin_func_t(WORD_LIST *);
+
+struct builtin {
+  char *name;
+  sh_builtin_func_t *function;
+  int flags;
+  char * const *long_doc;
+  const char *short_doc;
+  char *unused;
+};
+
+#endif
diff --git a/src/configure b/src/configure
new file mode 100755
index 0000000000..dc29eb79bc
--- /dev/null
+++ b/src/configure
@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+set -e
+
+src_dir="${0%/*}"
+
+if [ -z "$CC" ]; then
+  if type -p gcc >/dev/null; then
+    CC=gcc
+  else
+    echo "warning: gcc not found; using CC=cc" >&2
+    CC=cc
+  fi
+fi
+
+if ! type -p "$CC" >/dev/null; then
+  echo "aborted: compiler not found: $CC" >&2
+  exit 1
+fi
+
+case "$(uname -s)" in
+Darwin* )
+  host_os="darwin$(uname -r)"
+  ;;
+OpenBSD* )
+  host_os="openbsd$(uname -r)"
+  ;;
+* )
+  host_os="linux-gnu"
+esac
+
+eval "$("$src_dir"/shobj-conf -C "$CC" -o "$host_os")"
+
+sed "
+  s,@CC@,${CC},
+  s,@CFLAGS@,${CFLAGS},
+  s,@LOCAL_CFLAGS@,${LOCAL_CFLAGS},
+  s,@DEFS@,${DEFS},
+  s,@LOCAL_DEFS@,${LOCAL_DEFS},
+  s,@SHOBJ_CC@,${SHOBJ_CC},
+  s,@SHOBJ_CFLAGS@,${SHOBJ_CFLAGS},
+  s,@SHOBJ_LD@,${SHOBJ_LD},
+  s,@SHOBJ_LDFLAGS@,${SHOBJ_LDFLAGS//,/\,},
+  s,@SHOBJ_XLDFLAGS@,${SHOBJ_XLDFLAGS//,/\,},
+  s,@SHOBJ_LIBS@,${SHOBJ_LIBS},
+  s,@SHOBJ_STATUS@,${SHOBJ_STATUS},
+" "$src_dir"/Makefile.in > "$src_dir"/Makefile
diff --git a/src/realpath.c b/src/realpath.c
new file mode 100644
index 0000000000..6c0c9f3c12
--- /dev/null
+++ b/src/realpath.c
@@ -0,0 +1,43 @@
+#include "bash.h"
+#include <stdlib.h>
+#include <stdio.h>
+
+int realpath_builtin(list)
+WORD_LIST *list;
+{
+	int es;
+	char *realbuf, *p;
+
+	if (list == 0) {
+		// builtin_usage();
+		return (EX_USAGE);
+	}
+
+	for (es = EXECUTION_SUCCESS; list; list = list->next) {
+		p = list->word->word;
+		realbuf = realpath(p, NULL);
+		if (realbuf == NULL) {
+			es = EXECUTION_FAILURE;
+			// builtin_error("%s: cannot resolve: %s", p, strerror(errno));
+		} else {
+			printf("%s\n", realbuf);
+			free(realbuf);
+		}
+	}
+	return es;
+}
+
+char *realpath_doc[] = {
+	"Display each PATHNAME argument, resolving symbolic links. The exit status",
+	"is 0 if each PATHNAME was resolved; non-zero otherwise.",
+	(char *)NULL
+};
+
+struct builtin realpath_struct = {
+	"realpath",
+	realpath_builtin,
+	BUILTIN_ENABLED,
+	realpath_doc,
+	"realpath pathname [pathname...]",
+	0
+};
diff --git a/src/shobj-conf b/src/shobj-conf
new file mode 100755
index 0000000000..593867eeb7
--- /dev/null
+++ b/src/shobj-conf
@@ -0,0 +1,558 @@
+#! /bin/sh
+#
+# shobj-conf -- output a series of variable assignments to be substituted
+#		into a Makefile by configure which specify system-dependent
+#		information for creating shared objects that may be loaded
+#		into bash with `enable -f'
+#
+# usage: shobj-conf [-C compiler] -c host_cpu -o host_os -v host_vendor
+#
+# Chet Ramey
+# chet@po.cwru.edu
+
+# Copyright (C) 1996-2002 Free Software Foundation, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA.
+
+#
+# defaults
+#
+SHOBJ_STATUS=supported
+SHLIB_STATUS=supported
+
+SHOBJ_CC=cc
+SHOBJ_CFLAGS=
+SHOBJ_LD=
+SHOBJ_LDFLAGS=
+SHOBJ_XLDFLAGS=
+SHOBJ_LIBS=
+
+SHLIB_XLDFLAGS=
+SHLIB_LIBS=
+
+SHLIB_DOT='.'
+SHLIB_LIBPREF='lib'
+SHLIB_LIBSUFF='so'
+
+SHLIB_LIBVERSION='$(SHLIB_LIBSUFF)'
+SHLIB_DLLVERSION='$(SHLIB_MAJOR)'
+
+PROGNAME=`basename $0`
+USAGE="$PROGNAME [-C compiler] -c host_cpu -o host_os -v host_vendor"
+
+while [ $# -gt 0 ]; do
+	case "$1" in
+	-C)	shift; SHOBJ_CC="$1"; shift ;;
+	-c)	shift; host_cpu="$1"; shift ;;
+	-o)	shift; host_os="$1"; shift ;;
+	-v)	shift; host_vendor="$1"; shift ;;
+	*)	echo "$USAGE" >&2 ; exit 2;;
+	esac
+done
+
+case "${host_os}-${SHOBJ_CC}" in
+sunos4*-*gcc*)
+	SHOBJ_CFLAGS=-fpic
+	SHOBJ_LD=/usr/bin/ld
+	SHOBJ_LDFLAGS='-assert pure-text'
+
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)$(SHLIB_MINOR)'
+	;;
+
+sunos4*)
+	SHOBJ_CFLAGS=-pic
+	SHOBJ_LD=/usr/bin/ld
+	SHOBJ_LDFLAGS='-assert pure-text'
+
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)$(SHLIB_MINOR)'
+	;;
+
+sunos5*-*gcc*|solaris2*-*gcc*)
+	SHOBJ_CFLAGS=-fpic
+	SHOBJ_LD='${CC}'
+	ld_used=`gcc -print-prog-name=ld`
+	if ${ld_used} -V 2>&1 | grep GNU >/dev/null 2>&1; then
+		# This line works for the GNU ld
+		SHOBJ_LDFLAGS='-shared -Wl,-h,$@'
+	else
+		# This line works for the Solaris linker in /usr/ccs/bin/ld
+		SHOBJ_LDFLAGS='-shared -Wl,-i -Wl,-h,$@'
+	fi
+
+#	SHLIB_XLDFLAGS='-R $(libdir)'
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+sunos5*|solaris2*)
+	SHOBJ_CFLAGS='-K pic'
+	SHOBJ_LD=/usr/ccs/bin/ld
+	SHOBJ_LDFLAGS='-G -dy -z text -i -h $@'
+
+#	SHLIB_XLDFLAGS='-R $(libdir)'
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+# All versions of Linux or the semi-mythical GNU Hurd.
+linux*-*|gnu*-*|k*bsd*-gnu-*)
+	SHOBJ_CFLAGS=-fPIC
+	SHOBJ_LD='${CC}'
+	SHOBJ_LDFLAGS='-shared -Wl,-soname,$@'
+
+	SHLIB_XLDFLAGS='-Wl,-rpath,$(libdir) -Wl,-soname,`basename $@ $(SHLIB_MINOR)`'
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)$(SHLIB_MINOR)'
+	;;
+
+freebsd2* | netbsd*)
+	SHOBJ_CFLAGS=-fpic
+	SHOBJ_LD=ld
+	SHOBJ_LDFLAGS='-x -Bshareable'
+
+	SHLIB_XLDFLAGS='-R$(libdir)'
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)$(SHLIB_MINOR)'
+	;;
+
+# FreeBSD-3.x ELF
+freebsd[3-9]*|freebsdelf[3-9]*|freebsdaout[3-9]*|dragonfly*)
+	SHOBJ_CFLAGS=-fpic
+	SHOBJ_LD='${CC}'
+
+	if [ -x /usr/bin/objformat ] && [ "`/usr/bin/objformat`" = "elf" ]; then
+		SHOBJ_LDFLAGS='-shared -Wl,-soname,$@'
+
+		SHLIB_XLDFLAGS='-Wl,-rpath,$(libdir)'
+		SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	else
+		SHOBJ_LDFLAGS='-shared'
+
+		SHLIB_XLDFLAGS='-R$(libdir)'
+		SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)$(SHLIB_MINOR)'
+	fi
+	;;
+
+# Darwin/MacOS X
+darwin1*)
+	SHOBJ_STATUS=supported
+	SHLIB_STATUS=supported
+	
+	SHOBJ_CFLAGS=''
+	SHLIB_LIBSUFF='dylib'
+
+	SHOBJ_LD='${CC}'
+	SHOBJ_LDFLAGS='-dynamiclib'
+	;;
+
+darwin8*)
+	SHOBJ_STATUS=supported
+	SHLIB_STATUS=supported
+	
+	SHOBJ_CFLAGS='-fno-common'
+
+	SHOBJ_LD='MACOSX_DEPLOYMENT_TARGET=10.3 ${CC}'
+
+	SHLIB_LIBVERSION='$(SHLIB_MAJOR)$(SHLIB_MINOR).$(SHLIB_LIBSUFF)'
+	SHLIB_LIBSUFF='dylib'
+
+	SHOBJ_LDFLAGS='-undefined dynamic_lookup'
+	SHLIB_XLDFLAGS='-dynamiclib -arch_only `/usr/bin/arch` -install_name $(libdir)/$@ -current_version $(SHLIB_MAJOR)$(SHLIB_MINOR) -compatibility_version $(SHLIB_MAJOR) -v'
+
+	SHLIB_LIBS='-lncurses'	# see if -lcurses works on MacOS X 10.1 
+	;;
+
+darwin*|macosx*)
+	SHOBJ_STATUS=unsupported
+	SHLIB_STATUS=supported
+
+	SHOBJ_CFLAGS='-fno-common'
+
+	SHOBJ_LD='${CC}'
+
+	SHLIB_LIBVERSION='$(SHLIB_MAJOR)$(SHLIB_MINOR).$(SHLIB_LIBSUFF)'
+	SHLIB_LIBSUFF='dylib'
+
+	case "${host_os}" in
+	darwin[78]*)	SHOBJ_LDFLAGS=''
+			SHLIB_XLDFLAGS='-dynamiclib -arch_only `/usr/bin/arch` -install_name $(libdir)/$@ -current_version $(SHLIB_MAJOR)$(SHLIB_MINOR) -compatibility_version $(SHLIB_MAJOR) -v'
+			;;
+	*)		SHOBJ_LDFLAGS='-dynamic'
+			SHLIB_XLDFLAGS='-arch_only `/usr/bin/arch` -install_name $(libdir)/$@ -current_version $(SHLIB_MAJOR)$(SHLIB_MINOR) -compatibility_version $(SHLIB_MAJOR) -v'
+			;;
+	esac
+
+	SHLIB_LIBS='-lncurses'	# see if -lcurses works on MacOS X 10.1 
+	;;
+
+openbsd*)
+	SHOBJ_CFLAGS=-fPIC
+	SHOBJ_LD='${CC}'
+	SHOBJ_LDFLAGS='-shared'
+
+	SHLIB_XLDFLAGS='-R$(libdir)'
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)$(SHLIB_MINOR)'
+	;;
+
+bsdi2*)
+	SHOBJ_CC=shlicc2
+	SHOBJ_CFLAGS=
+	SHOBJ_LD=ld
+	SHOBJ_LDFLAGS=-r
+	SHOBJ_LIBS=-lc_s.2.1.0
+
+	# BSD/OS 2.x and 3.x `shared libraries' are too much of a pain in
+	# the ass -- they require changing {/usr/lib,etc}/shlib.map on
+	# each system, and the library creation process is byzantine
+	SHLIB_STATUS=unsupported
+	;;
+
+bsdi3*)
+	SHOBJ_CC=shlicc2
+	SHOBJ_CFLAGS=
+	SHOBJ_LD=ld
+	SHOBJ_LDFLAGS=-r
+	SHOBJ_LIBS=-lc_s.3.0.0
+
+	# BSD/OS 2.x and 3.x `shared libraries' are too much of a pain in
+	# the ass -- they require changing {/usr/lib,etc}/shlib.map on
+	# each system, and the library creation process is byzantine
+	SHLIB_STATUS=unsupported
+	;;
+
+bsdi4*)
+	# BSD/OS 4.x now supports ELF and SunOS-style dynamically-linked
+	# shared libraries.  gcc 2.x is the standard compiler, and the
+	# `normal' gcc options should work as they do in Linux.
+
+	SHOBJ_CFLAGS=-fPIC
+	SHOBJ_LD='${CC}'
+	SHOBJ_LDFLAGS='-shared -Wl,-soname,$@'
+
+	SHLIB_XLDFLAGS='-Wl,-soname,`basename $@ $(SHLIB_MINOR)`'
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)$(SHLIB_MINOR)'
+	;;
+
+osf*-*gcc*)
+	# Fix to use gcc linker driver from bfischer@TechFak.Uni-Bielefeld.DE
+	SHOBJ_LD='${CC}'
+	SHOBJ_LDFLAGS='-shared -Wl,-soname,$@'
+
+	SHLIB_XLDFLAGS='-rpath $(libdir)'
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+osf*)
+	SHOBJ_LD=ld
+	SHOBJ_LDFLAGS='-shared -soname $@ -expect_unresolved "*"'
+
+	SHLIB_XLDFLAGS='-rpath $(libdir)'
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+aix4.[2-9]*-*gcc*)		# lightly tested by jik@cisco.com
+	SHOBJ_CFLAGS=-fpic
+	SHOBJ_LD='ld'
+	SHOBJ_LDFLAGS='-bdynamic -bnoentry -bexpall'
+	SHOBJ_XLDFLAGS='-G'
+
+	SHLIB_XLDFLAGS='-bM:SRE'
+	SHLIB_LIBS='-lcurses -lc'
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+aix4.[2-9]*)
+	SHOBJ_CFLAGS=-K
+	SHOBJ_LD='ld'
+	SHOBJ_LDFLAGS='-bdynamic -bnoentry -bexpall'
+	SHOBJ_XLDFLAGS='-G'
+
+	SHLIB_XLDFLAGS='-bM:SRE'
+	SHLIB_LIBS='-lcurses -lc'
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+#
+# THE FOLLOWING ARE UNTESTED -- and some may not support the dlopen interface
+#
+irix[56]*-*gcc*)
+	SHOBJ_CFLAGS='-fpic'
+	SHOBJ_LD='${CC}'
+	SHOBJ_LDFLAGS='-shared -Wl,-soname,$@'
+
+	SHLIB_XLDFLAGS='-Wl,-rpath,$(libdir)'
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+irix[56]*)
+	SHOBJ_CFLAGS='-K PIC'
+	SHOBJ_LD=ld
+#	SHOBJ_LDFLAGS='-call_shared -hidden_symbol -no_unresolved -soname $@'
+#	Change from David Kaelbling <drk@sgi.com>.  If you have problems,
+#	remove the `-no_unresolved'
+	SHOBJ_LDFLAGS='-shared -no_unresolved -soname $@'
+
+	SHLIB_XLDFLAGS='-rpath $(libdir)'
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+hpux9*-*gcc*)
+	# must use gcc; the bundled cc cannot compile PIC code
+	SHOBJ_CFLAGS='-fpic'
+	SHOBJ_LD='${CC}'
+	SHOBJ_LDFLAGS='-shared -Wl,-b -Wl,+s'
+
+	SHLIB_XLDFLAGS='-Wl,+b,$(libdir)'
+	SHLIB_LIBSUFF='sl'
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+hpux9*)
+	SHOBJ_STATUS=unsupported
+	SHLIB_STATUS=unsupported
+
+	# If you are using the HP ANSI C compiler, you can uncomment and use
+	# this code (I have not tested it)
+#	SHOBJ_STATUS=supported
+#	SHLIB_STATUS=supported
+#
+#	SHOBJ_CFLAGS='+z'
+#	SHOBJ_LD='ld'
+#	SHOBJ_LDFLAGS='-b +s'
+#
+#	SHLIB_XLDFLAGS='+b $(libdir)'
+#	SHLIB_LIBSUFF='sl'
+#	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'	
+
+	;;
+
+hpux10*-*gcc*)
+	# must use gcc; the bundled cc cannot compile PIC code
+	SHOBJ_CFLAGS='-fpic'
+	SHOBJ_LD='${CC}'
+	# if you have problems linking here, moving the `-Wl,+h,$@' from
+	# SHLIB_XLDFLAGS to SHOBJ_LDFLAGS has been reported to work
+	SHOBJ_LDFLAGS='-shared -Wl,-b -Wl,+s'
+
+	SHLIB_XLDFLAGS='-Wl,+h,$@ -Wl,+b,$(libdir)'
+	SHLIB_LIBSUFF='sl'
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+hpux10*)
+	SHOBJ_STATUS=unsupported
+	SHLIB_STATUS=unsupported
+
+	# If you are using the HP ANSI C compiler, you can uncomment and use
+	# this code (I have not tested it)
+#	SHOBJ_STATUS=supported
+#	SHLIB_STATUS=supported
+#
+#	SHOBJ_CFLAGS='+z'
+#	SHOBJ_LD='ld'
+#	SHOBJ_LDFLAGS='-b +s +h $@'
+#
+#	SHLIB_XLDFLAGS='+b $(libdir)'
+#	SHLIB_LIBSUFF='sl'
+#	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'	
+
+	;;
+
+hpux11*-*gcc*)
+	# must use gcc; the bundled cc cannot compile PIC code
+	SHOBJ_CFLAGS='-fpic'
+	SHOBJ_LD='${CC}'
+#	SHOBJ_LDFLAGS='-shared -Wl,-b -Wl,-B,symbolic -Wl,+s -Wl,+std -Wl,+h,$@'
+	SHOBJ_LDFLAGS='-shared -fpic -Wl,-b -Wl,+s -Wl,+h,$@'
+
+	SHLIB_XLDFLAGS='-Wl,+b,$(libdir)'
+	SHLIB_LIBSUFF='sl'
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+hpux11*)
+	SHOBJ_STATUS=unsupported
+	SHLIB_STATUS=unsupported
+
+	# If you are using the HP ANSI C compiler, you can uncomment and use
+	# this code (I have not tested it)
+#	SHOBJ_STATUS=supported
+#	SHLIB_STATUS=supported
+#
+#	SHOBJ_CFLAGS='+z'
+#	SHOBJ_LD='ld'
+#	SHOBJ_LDFLAGS='-b +s +h $@'
+#
+#	SHLIB_XLDFLAGS='+b $(libdir)'
+#	SHLIB_LIBSUFF='sl'
+#	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'	
+
+	;;
+
+sysv4*-*gcc*)
+	SHOBJ_CFLAGS=-shared
+	SHOBJ_LDFLAGS='-shared -h $@'
+	SHOBJ_LD='${CC}'
+
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+sysv4*)
+	SHOBJ_CFLAGS='-K PIC'
+	SHOBJ_LD=ld
+	SHOBJ_LDFLAGS='-dy -z text -G -h $@'
+
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+sco3.2v5*-*gcc*)
+	SHOBJ_CFLAGS='-fpic'		# DEFAULTS TO ELF
+	SHOBJ_LD='${CC}'
+	SHOBJ_LDFLAGS='-shared'
+
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+sco3.2v5*)
+	SHOBJ_CFLAGS='-K pic -b elf'
+	SHOBJ_LD=ld
+	SHOBJ_LDFLAGS='-G -b elf -dy -z text -h $@'
+
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+sysv5uw7*-*gcc*)
+	SHOBJ_CFLAGS='-fpic'
+	SHOBJ_LD='${CC}'
+	SHOBJ_LDFLAGS='-shared'
+
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+sysv5uw7*)
+	SHOBJ_CFLAGS='-K PIC'
+	SHOBJ_LD=ld
+	SHOBJ_LDFLAGS='-G -dy -z text -h $@'
+
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+sysv5UnixWare*-*gcc*)
+	SHOBJ_CFLAGS=-fpic
+	SHOBJ_LD='${CC}'
+	SHOBJ_LDFLAGS='-shared'
+
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+sysv5UnixWare*)
+	SHOBJ_CFLAGS='-K PIC'
+	SHOBJ_LD=ld
+	SHOBJ_LDFLAGS='-G -dy -z text -h $@'
+
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+sysv5OpenUNIX*-*gcc*)
+	SHOBJ_CFLAGS=-fpic
+	SHOBJ_LD='${CC}'
+	SHOBJ_LDFLAGS='-shared'
+
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+sysv5OpenUNIX*)
+	SHOBJ_CFLAGS='-K PIC'
+	SHOBJ_LD=ld
+	SHOBJ_LDFLAGS='-G -dy -z text -h $@'
+
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+dgux*-*gcc*)
+	SHOBJ_CFLAGS=-fpic
+	SHOBJ_LD='${CC}'
+	SHOBJ_LDFLAGS='-shared'
+
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+dgux*)
+	SHOBJ_CFLAGS='-K pic'
+	SHOBJ_LD=ld
+	SHOBJ_LDFLAGS='-G -dy -h $@'
+
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+msdos*)
+	SHOBJ_STATUS=unsupported
+	SHLIB_STATUS=unsupported
+	;;
+
+cygwin*)
+	SHOBJ_LD='$(CC)'
+        SHOBJ_LDFLAGS='-shared -Wl,--enable-auto-import -Wl,--enable-auto-image-base -Wl,--export-all -Wl,--out-implib=$(@).a'
+        SHLIB_LIBPREF='cyg'
+        SHLIB_LIBSUFF='dll'
+        SHLIB_LIBVERSION='$(SHLIB_DLLVERSION).$(SHLIB_LIBSUFF)'
+        SHLIB_LIBS='$(TERMCAP_LIB)'
+
+	SHLIB_DOT=
+        # For official cygwin releases, DLLVERSION will be defined in the
+        # environment of configure, and will be incremented any time the API
+        # changes in a non-backwards compatible manner.  Otherwise, it is just
+        # SHLIB_MAJOR.
+        if [ -n "$DLLVERSION" ] ; then
+		SHLIB_DLLVERSION="$DLLVERSION"
+        fi
+	;;
+
+#
+# Rely on correct gcc configuration for everything else
+#
+*-*gcc*)
+	SHOBJ_CFLAGS=-fpic
+	SHOBJ_LD='${CC}'
+	SHOBJ_LDFLAGS='-shared'
+
+	SHLIB_LIBVERSION='$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)'
+	;;
+
+*)
+	SHOBJ_STATUS=unsupported
+	SHLIB_STATUS=unsupported
+	;;
+
+esac
+
+echo SHOBJ_CC=\'"$SHOBJ_CC"\'
+echo SHOBJ_CFLAGS=\'"$SHOBJ_CFLAGS"\'
+echo SHOBJ_LD=\'"$SHOBJ_LD"\'
+echo SHOBJ_LDFLAGS=\'"$SHOBJ_LDFLAGS"\'
+echo SHOBJ_XLDFLAGS=\'"$SHOBJ_XLDFLAGS"\'
+echo SHOBJ_LIBS=\'"$SHOBJ_LIBS"\'
+
+echo SHLIB_XLDFLAGS=\'"$SHLIB_XLDFLAGS"\'
+echo SHLIB_LIBS=\'"$SHLIB_LIBS"\'
+
+echo SHLIB_DOT=\'"$SHLIB_DOT"\'
+
+echo SHLIB_LIBPREF=\'"$SHLIB_LIBPREF"\'
+echo SHLIB_LIBSUFF=\'"$SHLIB_LIBSUFF"\'
+
+echo SHLIB_LIBVERSION=\'"$SHLIB_LIBVERSION"\'
+echo SHLIB_DLLVERSION=\'"$SHLIB_DLLVERSION"\'
+
+echo SHOBJ_STATUS=\'"$SHOBJ_STATUS"\'
+echo SHLIB_STATUS=\'"$SHLIB_STATUS"\'
+
+exit 0
diff --git a/test/init.bats b/test/init.bats
index f5e60c0382..713dad5805 100644
--- a/test/init.bats
+++ b/test/init.bats
@@ -21,7 +21,7 @@ load test_helper
   root="$(cd $BATS_TEST_DIRNAME/.. && pwd)"
   run pyenv-init - bash
   assert_success
-  assert_line "source '${root}/libexec/../completions/pyenv.bash'"
+  assert_line "source '${root}/test/../libexec/../completions/pyenv.bash'"
 }
 
 @test "detect parent shell" {
@@ -35,7 +35,7 @@ load test_helper
   root="$(cd $BATS_TEST_DIRNAME/.. && pwd)"
   run pyenv-init - fish
   assert_success
-  assert_line ". '${root}/libexec/../completions/pyenv.fish'"
+  assert_line ". '${root}/test/../libexec/../completions/pyenv.fish'"
 }
 
 @test "fish instructions" {
@@ -68,7 +68,7 @@ load test_helper
   export PATH="${PYENV_ROOT}/shims:$PATH"
   run pyenv-init - bash
   assert_success
-  refute_line 'export PATH="'${PYENV_ROOT}'/shims:${PATH}"'
+  assert_line 0 'export PATH="'${PYENV_ROOT}'/shims:${PATH}"'
 }
 
 @test "doesn't add shims to PATH more than once (fish)" {
@@ -77,3 +77,20 @@ load test_helper
   assert_success
   refute_line 'setenv PATH "'${PYENV_ROOT}'/shims" $PATH ;'
 }
+
+@test "outputs sh-compatible syntax" {
+  run pyenv-init - bash
+  assert_success
+  assert_line '  case "$command" in'
+
+  run pyenv-init - zsh
+  assert_success
+  assert_line '  case "$command" in'
+}
+
+@test "outputs fish-specific syntax (fish)" {
+  run pyenv-init - fish
+  assert_success
+  assert_line '  switch "$command"'
+  refute_line '  case "$command" in'
+}
diff --git a/test/libexec/pyenv-echo b/test/libexec/pyenv-echo
index 0a802df4b5..ee32210438 100755
--- a/test/libexec/pyenv-echo
+++ b/test/libexec/pyenv-echo
@@ -1,2 +1,9 @@
 #!/usr/bin/env bash
-eval "echo \$$1"
+# Usage: pyenv echo [-F<char>] VAR
+
+if [[ $1 == -F* ]]; then
+  sep="${1:2}"
+  echo "${!2}" | tr "${sep:-:}" $'\n'
+else
+  echo "${!1}"
+fi
diff --git a/test/pyenv.bats b/test/pyenv.bats
index 6e07825fa0..0966bfe88d 100644
--- a/test/pyenv.bats
+++ b/test/pyenv.bats
@@ -45,3 +45,31 @@ load test_helper
   assert_failure
   assert_output "pyenv: cannot change working directory to \`$dir'"
 }
+
+@test "adds its own libexec to PATH" {
+  run pyenv echo "PATH"
+  assert_success "${BATS_TEST_DIRNAME%/*}/libexec:$PATH"
+}
+
+@test "adds plugin bin dirs to PATH" {
+  mkdir -p "$PYENV_ROOT"/plugins/python-build/bin
+  mkdir -p "$PYENV_ROOT"/plugins/pyenv-each/bin
+  run pyenv echo -F: "PATH"
+  assert_success
+  assert_line 0 "${BATS_TEST_DIRNAME%/*}/libexec"
+  assert_line 1 "${PYENV_ROOT}/plugins/python-build/bin"
+  assert_line 2 "${PYENV_ROOT}/plugins/pyenv-each/bin"
+}
+
+@test "PYENV_HOOK_PATH preserves value from environment" {
+  PYENV_HOOK_PATH=/my/hook/path:/other/hooks run pyenv echo -F: "PYENV_HOOK_PATH"
+  assert_success
+  assert_line 0 "/my/hook/path"
+  assert_line 1 "/other/hooks"
+  assert_line 2 "${PYENV_ROOT}/pyenv.d"
+}
+
+@test "PYENV_HOOK_PATH includes pyenv built-in plugins" {
+  run pyenv echo "PYENV_HOOK_PATH"
+  assert_success ":${PYENV_ROOT}/pyenv.d:${BATS_TEST_DIRNAME%/*}/pyenv.d:/usr/local/etc/pyenv.d:/etc/pyenv.d:/usr/lib/pyenv/hooks"
+}
diff --git a/test/run b/test/run
new file mode 100755
index 0000000000..01cd60918f
--- /dev/null
+++ b/test/run
@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+set -e
+
+if [ -n "$PYENV_NATIVE_EXT" ]; then
+  src/configure
+  make -C src
+fi
+
+exec bats ${CI:+--tap} test
diff --git a/test/test_helper.bash b/test/test_helper.bash
index 9bd8082d97..6e5015c652 100644
--- a/test/test_helper.bash
+++ b/test/test_helper.bash
@@ -1,7 +1,15 @@
 unset PYENV_VERSION
 unset PYENV_DIR
 
-PYENV_TEST_DIR="${BATS_TMPDIR}/pyenv"
+if enable -f "${BATS_TEST_DIRNAME}"/../libexec/pyenv-realpath.dylib realpath 2>/dev/null; then
+  PYENV_TEST_DIR="$(realpath "$BATS_TMPDIR")/pyenv"
+else
+  if [ -n "$PYENV_NATIVE_EXT" ]; then
+    echo "pyenv: failed to load \`realpath' builtin" >&2
+    exit 1
+  fi
+  PYENV_TEST_DIR="${BATS_TMPDIR}/pyenv"
+fi
 
 # guard against executing this block twice due to bats internals
 if [ "$PYENV_ROOT" != "${PYENV_TEST_DIR}/root" ]; then