libtool.m4: Add support for slimcc

Reported: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=79216
diff --git a/m4/libtool.m4 b/m4/libtool.m4
index 495bd10..7f92e5e 100644
--- a/m4/libtool.m4
+++ b/m4/libtool.m4
@@ -5000,6 +5000,12 @@
 	_LT_TAGVAR(lt_prog_compiler_pic, $1)='-fPIC'
 	_LT_TAGVAR(lt_prog_compiler_static, $1)='-static'
 	;;
+      slimcc*)
+	# Hsiang-Ying Fu and Jim Huang's x86_64 SlimCC compiler
+	_LT_TAGVAR(lt_prog_compiler_wl, $1)='-Wl,'
+	_LT_TAGVAR(lt_prog_compiler_pic, $1)='-fPIC'
+	_LT_TAGVAR(lt_prog_compiler_static, $1)='-static'
+	;;
       pgcc* | pgf77* | pgf90* | pgf95* | pgfortran*)
         # Portland Group compilers (*not* the Pentium gcc compiler,
 	# which looks to be a dead project)