1 files changed, 2 insertions, 1 deletions

diff --git a/src/Makefile.in b/src/Makefile.in
index 4092005e8f1..d1ea05166a3 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -10,6 +10,7 @@ MAKE = make
 CC=cc
 CPP=cc -E
 CFLAGS=-g
+C_SWITCH_SYSTEM=
 srcdir=@srcdir@/src
 VPATH=@srcdir@/src
 LN_S=ln -s
@@ -79,7 +80,7 @@ relock:
 xmakefile: ymakefile config.h ../config.status
         -rm -f xmakefile xmakefile.new junk.c junk.cpp
         cp ${srcdir}/ymakefile junk.c
-        ${CPP} -I${srcdir} ${CFLAGS} junk.c > junk.cpp
+        ${CPP} -I${srcdir} ${CFLAGS} ${C_SWITCH_SYSTEM} junk.c > junk.cpp
         < junk.cpp                                      \
         sed     -e 's/^#.*//'                           \
                 -e 's/^[ \f\t][ \f\t]*$$//'             \