Revert "Merge pull request #1"

This reverts commit a054de4, reversing
changes made to a43c650.

Makefile.in

@@ -145,7 +145,7 @@ BC_NUM_KARATSUBA_LEN = %%KARATSUBA_LEN%%
 CPPFLAGS1 = -D$(BC_ENABLED_NAME)=$(BC_ENABLED) -D$(DC_ENABLED_NAME)=$(DC_ENABLED)
 CPPFLAGS2 = $(CPPFLAGS1) -I./include/ -DVERSION=$(VERSION) %%LONG_BIT_DEFINE%%
 CPPFLAGS3 = $(CPPFLAGS2) -DEXECPREFIX=$(EXEC_PREFIX) -DMAINEXEC=$(MAIN_EXEC)
-CPPFLAGS4 = $(CPPFLAGS3) -D_POSIX_C_SOURCE=200809L
+CPPFLAGS4 = $(CPPFLAGS3) -D_POSIX_C_SOURCE=200112L -D_XOPEN_SOURCE=600
 CPPFLAGS5 = $(CPPFLAGS4) -DBC_NUM_KARATSUBA_LEN=$(BC_NUM_KARATSUBA_LEN)
 CPPFLAGS6 = $(CPPFLAGS5) -DBC_ENABLE_NLS=$(BC_ENABLE_NLS) -DBC_ENABLE_PROMPT=$(BC_ENABLE_PROMPT)
 CPPFLAGS7 = $(CPPFLAGS6) -D$(BC_ENABLE_EXTRA_MATH_NAME)=$(BC_ENABLE_EXTRA_MATH)

README.md

@@ -27,10 +27,10 @@ This `bc` is Free and Open Source Software (FOSS). It is offered under the BSD
 ## Prerequisites
 
 This `bc` only requires a C99-compatible compiler and a (mostly) POSIX
-2008-compatible system.
+2001-compatible system with the XSI (X/Open System Interfaces) option group.
 
-Since POSIX 2008 requires the existence of a C99 compiler as `c99`, any
-POSIX-compatible system will have everything needed.
+Since POSIX 2001 with XSI requires the existence of a C99 compiler as `c99`, any
+POSIX and XSI-compatible system will have everything needed.
 
 Systems that are known to work:
 

configure.sh

@@ -695,7 +695,7 @@ if [ "$nls" -ne 0 ]; then
 	flags="-DBC_ENABLE_NLS=1 -DBC_ENABLED=$bc -DDC_ENABLED=$dc -DBC_ENABLE_SIGNALS=$signals"
 	flags="$flags -DBC_ENABLE_HISTORY=$hist"
 	flags="$flags -DBC_ENABLE_EXTRA_MATH=$extra_math -I./include/"
-	flags="$flags -D_POSIX_C_SOURCE=200809L"
+	flags="$flags -D_POSIX_C_SOURCE=200112L -D_XOPEN_SOURCE=600"
 
 	"$HOSTCC" $HOSTCFLAGS $flags -c "src/vm.c" -o "$scriptdir/vm.o" > /dev/null 2>&1
 
@@ -768,7 +768,7 @@ if [ "$hist" -eq 1 ]; then
 	flags="-DBC_ENABLE_HISTORY=1 -DBC_ENABLED=$bc -DDC_ENABLED=$dc -DBC_ENABLE_SIGNALS=$signals"
 	flags="$flags -DBC_ENABLE_NLS=$nls"
 	flags="$flags -DBC_ENABLE_EXTRA_MATH=$extra_math -I./include/"
-	flags="$flags -D_POSIX_C_SOURCE=200809L"
+	flags="$flags -D_POSIX_C_SOURCE=200112L -D_XOPEN_SOURCE=600"
 
 	"$HOSTCC" $HOSTCFLAGS $flags -c "src/history/history.c" -o "$scriptdir/history.o" > /dev/null 2>&1