build: Fix skel.c generation with BSD make

diff --git a/src/Makefile.am b/src/Makefile.am
index 18aeec3cc4262aa2475e91c6cf4713b5b257c576..9fe0788d76436a1c0b085aafad193ce21f237535 100644 (file)
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -76,7 +76,7 @@ CLEANFILES = stage1scan.c stage1flex$(EXEEXT)
 MAINTAINERCLEANFILES = skel.c
 
 skel.c: flex.skl mkskel.sh flexint.h tables_shared.h tables_shared.c
-       sed 's/4_/a4_/g; s/m4preproc_/m4_/g' $< | \
+       sed 's/4_/a4_/g; s/m4preproc_/m4_/g' flex.skl | \
          $(m4) -P -I $(srcdir)                                            \
            -DFLEX_MAJOR_VERSION=`   echo $(VERSION)|cut -f 1 -d .`        \
            -DFLEX_MINOR_VERSION=`   echo $(VERSION)|cut -f 2 -d .`        \