Make it possible to build libraries as static libraries only.

m4/buildsys.m4

@@ -20,6 +20,18 @@ dnl ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 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
+])
+
 AC_DEFUN([BUILDSYS_PROG_IMPLIB], [
 	AC_MSG_CHECKING(whether we need an implib)
 	case "$target" in
@@ -133,6 +145,29 @@ AC_DEFUN([BUILDSYS_SHARED_LIB], [
 	AC_SUBST(CLEAN_LIB)
 ])
 
+AC_DEFUN([BUILDSYS_STATIC_LIB_ONLY], [
+	AC_PATH_PROG(AR, ar)
+	AC_PROG_RANLIB
+
+	LIB_CPPFLAGS=''
+	LIB_CFLAGS=''
+	LIB_LDFLAGS=''
+	LIB_PREFIX='lib'
+	LIB_SUFFIX='.a'
+	INSTALL_LIB='${INSTALL} -m 644 $$i ${DESTDIR}${libdir}/$$i'
+	UNINSTALL_LIB='rm -f ${DESTDIR}${libdir}/$$i'
+	CLEAN_LIB=''
+
+	AC_SUBST(LIB_CPPFLAGS)
+	AC_SUBST(LIB_CFLAGS)
+	AC_SUBST(LIB_LDFLAGS)
+	AC_SUBST(LIB_PREFIX)
+	AC_SUBST(LIB_SUFFIX)
+	AC_SUBST(INSTALL_LIB)
+	AC_SUBST(UNINSTALL_LIB)
+	AC_SUBST(CLEAN_LIB)
+])
+
 AC_DEFUN([BUILDSYS_TOUCH_DEPS], [
 	${as_echo:="echo"} "${as_me:="configure"}: touching .deps files"
 	for i in $(find . -name Makefile); do