Add --module-schnorrsig option to secp256k1 build.

install.sh

@@ -393,8 +393,9 @@ BOOST_OPTIONS=(
 #------------------------------------------------------------------------------
 SECP256K1_OPTIONS=(
 "--disable-tests" \
+"--enable-experimental" \
 "--enable-module-recovery" \
-"--enable-endomorphism")
+"--enable-module-schnorrsig")
 
 # Define bitcoin-system options.
 #------------------------------------------------------------------------------
@@ -577,7 +578,7 @@ build_from_tarball()
     pop_directory
 }
 
-# Because boost ICU detection assumes in incorrect ICU path.
+# Because boost ICU static lib detection assumes in incorrect ICU path.
 circumvent_boost_icu_detection()
 {
     # Boost expects a directory structure for ICU which is incorrect.
@@ -617,27 +618,28 @@ initialize_boost_configuration()
 }
 
 # Because boost doesn't use pkg-config.
+# The hacks below are still required as of boost 1.72.0.
 initialize_boost_icu_configuration()
 {
     BOOST_ICU_ICONV="on"
     BOOST_ICU_POSIX="on"
 
     if [[ $WITH_ICU ]]; then
-        circumvent_boost_icu_detection
-
         # Restrict other locale options when compiling boost with icu.
         BOOST_ICU_ICONV="off"
         BOOST_ICU_POSIX="off"
 
+        # Work around boost ICU static lib discovery bug.
+        circumvent_boost_icu_detection
+
+        # Extract ICU prefix directory from package config variable.
+        ICU_PREFIX=$(pkg-config icu-i18n --variable=prefix)
+
         # Extract ICU libs from package config variables and augment with -ldl.
         ICU_LIBS="$(pkg-config icu-i18n --libs) -ldl"
 
         # This is a hack for boost m4 scripts that fail with ICU dependency.
-        # See custom edits in ax-boost-locale.m4 and ax_boost_regex.m4.
         export BOOST_ICU_LIBS=("${ICU_LIBS[@]}")
-
-        # Extract ICU prefix directory from package config variable.
-        ICU_PREFIX=$(pkg-config icu-i18n --variable=prefix)
     fi
 }
 
@@ -705,14 +707,14 @@ build_from_tarball_boost()
     # The zlib options prevent boost linkage to system libs in the case where
     # we have built zlib in a prefix dir. Disabling zlib in boost is broken in
     # all versions (through 1.61). There has been a patch pull request since
-    #  2015 but not merged as of 3/5/2021. svn.boost.org/trac/boost/ticket/9156
+    # 2015 but not merged as of 3/5/2021. svn.boost.org/trac/boost/ticket/9156
     # The bzip2 auto-detection is not implemented, but disabling it works.
 
     # boost_regex:
     # As of boost 1.72.0 the ICU_LINK symbol is no longer supported and
     # produces a hard stop if WITH_ICU is also defined. Removal is sufficient.
     # github.com/libbitcoin/libbitcoin-system/issues/1192
-    # "-sICU_LINK=${ICU_LIBS[*]}" \
+    # "-sICU_LINK=${ICU_LIBS[*]}"
 
     ./b2 install \
         "variant=release" \