libtool doesn't work if compiling with clang.  Need to add --tag=CC
Don't hardcode /usr/bin/libtool in gentoo prefix
See bug https://bugs.gentoo.org/731010

rdlibtool needs to find system libtool in current directory
See bug https://bugs.gentoo.org/778791
--- a/configure.ac
+++ b/configure.ac
@@ -17,6 +17,10 @@
 AC_LANG_C
 AM_PROG_AR
 
+dnl libtool
+LT_INIT
+AC_SUBST([LIBTOOL_DEPS])
+
 ## basic types
 
 AC_TYPE_INT8_T
--- a/xpaintrw/Makefile.am
+++ b/xpaintrw/Makefile.am
@@ -28,7 +28,8 @@
 
 xpaint_DEFINES = $(ARCH_DEFINES) $(EXTRA_DEFINES) $(XAWLIB_DEFINES)
 
-LIBTOOL = /usr/bin/libtool
+LIBTOOL = ../libtool
+AM_LIBTOOLFLAGS = --tag=CC
 AM_CFLAGS   = @X_CFLAGS@ @SPECIAL_CFLAGS@ $(xpaint_DEFINES)
 AM_YFLAGS     = -d
 CLEANFILES    = 
--- a/Makefile.am
+++ b/Makefile.am
@@ -53,12 +53,16 @@
 dist_man_MANS = xpaint.1 imgmerge.1
 AM_CFLAGS   = @X_CFLAGS@ @SPECIAL_CFLAGS@ $(xpaint_DEFINES)
 ACLOCAL_AMFLAGS = -I m4
-BUILT_SOURCES = version.h DefaultRC.txt.h messages.h XPaint.ad.h xpaint.1
+BUILT_SOURCES = version.h DefaultRC.txt.h messages.h XPaint.ad.h xpaint.1 libtool
 AM_YFLAGS     = -d
 CLEANFILES    = preproc substads \
 	version.h DefaultRC.txt.h messages.h XPaint.ad.h xpaint.1
 EXTRA_DIST    = 
 
+LIBTOOL_DEPS = @LIBTOOL_DEPS@
+libtool:
+	$(SHELL) ./config.status libtool
+
 BASE_HDRS = bitmap.h color.h crc32.h \
 	Colormap.h ColormapP.h graphic.h hash.h image.h \
 	menu.h messages.h misc.h operation.h ops.h \