X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;f=synfig-core%2Fconfigure.ac;h=33a733dc55ab576e5d302e500303ea895c70c731;hb=c8dfc1fcfebdcc765fac4de28731a783b6099c35;hp=dd40d94e1af8f612e4314bdd95b89279dc7ad302;hpb=088fde89ce190900cbc9e35bace4cceb5af1737a;p=synfig.git

diff --git a/synfig-core/configure.ac b/synfig-core/configure.ac
index dd40d94..33a733d 100644
--- a/synfig-core/configure.ac
+++ b/synfig-core/configure.ac
@@ -622,8 +622,11 @@ AC_SUBST(CXXFLAGS)
 AC_SUBST(CPPFLAGS)
 AC_SUBST(LDFLAGS)
 
-# this line is required for libtool 1.5.26 but must not be present for libtool 2.2.4...
-# AC_CONFIG_SUBDIRS(libltdl)
+# AC_CONFIG_SUBDIRS(libltdl) is required for libtool 1.5.26 but must not be present for
+# libtool 2.2.4. Problem seems to be that AC_LIB_LTDL (above) now calls AC_CONFIG_SUBDIRS
+# itself, through LTDL_INIT, _LTDL_SETUP, _LTDL_MODE_DISPATCH. We need to check the
+# condition that libltdl has already been registered with AC_CONFIG_SUBDIRS:
+m4_ifdef([_AC_SEEN_TAG(libltdl)], [], [AC_CONFIG_SUBDIRS(libltdl)])
 
 CONFIG_LIBS="-lsynfig"
 CONFIG_CFLAGS="$CONFIG_CFLAGS"