Index: m4/buildsys.m4
==================================================================
--- m4/buildsys.m4
+++ m4/buildsys.m4
@@ -20,23 +20,21 @@
 dnl POSSIBILITY OF SUCH DAMAGE.
 dnl
 
 AC_DEFUN([BUILDSYS_LIB], [
 	AC_ARG_ENABLE(shared,
-		[  --disable-shared        don't build shared libraries],
-		enable_shared="$enableval")
-
-	if test x"$enableval" = x"no"; then
-		BUILDSYS_STATIC_LIB_ONLY
-	else
-		BUILDSYS_SHARED_LIB
-	fi
+		AS_HELP_STRING([--disable-shared], [don't build shared libraries]))
+
+	AS_IF([test x"$enable_shared" = x"no"],
+		BUILDSYS_STATIC_LIB_ONLY,
+		BUILDSYS_SHARED_LIB)
 ])
 
 AC_DEFUN([BUILDSYS_PROG_IMPLIB], [
+	AC_REQUIRE([AC_CANONICAL_HOST])
 	AC_MSG_CHECKING(whether we need an implib)
-	case "$target" in
+	case "$host" in
 		*-*-cygwin* | *-*-mingw*)
 			AC_MSG_RESULT(yes)
 			PROG_IMPLIB_NEEDED='yes'
 			PROG_IMPLIB_LDFLAGS='-Wl,-export-all-symbols,--out-implib,lib${PROG}.a'
 			;;
@@ -50,12 +48,13 @@
 	AC_SUBST(PROG_IMPLIB_NEEDED)
 	AC_SUBST(PROG_IMPLIB_LDFLAGS)
 ])
 
 AC_DEFUN([BUILDSYS_SHARED_LIB], [
+	AC_REQUIRE([AC_CANONICAL_HOST])
 	AC_MSG_CHECKING(for shared library system)
-	case "$target" in
+	case "$host" in
 		intel-apple-*)
 			AC_MSG_RESULT([Mac OS X (Intel)])
 			LIB_CPPFLAGS='-DPIC'
 			LIB_CFLAGS='-fPIC'
 			LIB_LDFLAGS='-dynamiclib -fPIC -install_name ${libdir}/${LIB}'
@@ -144,12 +143,12 @@
 	AC_SUBST(UNINSTALL_LIB)
 	AC_SUBST(CLEAN_LIB)
 ])
 
 AC_DEFUN([BUILDSYS_STATIC_LIB_ONLY], [
-	AC_PATH_PROG(AR, ar)
-	AC_PROG_RANLIB
+	AC_REQUIRE([AC_PROG_RANLIB])
+	AC_PATH_TOOL(AR, ar)
 
 	LIB_CPPFLAGS=''
 	LIB_CFLAGS=''
 	LIB_LDFLAGS=''
 	LIB_PREFIX='lib'