diff --git a/.gitignore b/.gitignore
index b1f6fdb6..c9822cfa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,6 +10,8 @@ config.h
 config.log
 Makefile
 Makefile.in
+cscope.out
+tags
 .deps
 stamp-h1
 *.o
diff --git a/Makefile.am b/Makefile.am
index c6900a35..e327ddc6 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -4,3 +4,10 @@ SUBDIRS = gl libopts src doc
 
 ACLOCAL_AMFLAGS = -I gl/m4 -I libopts/m4 -I m4
 
+ctags:
+	find . -type f -name "*.[ch]*" | xargs @CTAGS@
+
+cscope:
+	@CSCOPE@ -b -R
+
+cref: ctags cscope
diff --git a/configure.ac b/configure.ac
index cee1e084..1cb55acf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -15,6 +15,8 @@ AM_PROG_CC_C_O
 if [ test "$GCC" = "yes" ];then
 	CFLAGS="$CFLAGS -Wall"
 fi
+AC_PATH_PROG(CTAGS, ctags, /bin/true)
+AC_PATH_PROG(CSCOPE, cscope, /bin/true)
 
 AC_CHECK_SIZEOF([unsigned long])
 AC_C_BIGENDIAN