diff --git a/hw/xfree86/loader/Makefile.am b/hw/xfree86/loader/Makefile.am
index 19c7dabe3..8732a490a 100644
--- a/hw/xfree86/loader/Makefile.am
+++ b/hw/xfree86/loader/Makefile.am
@@ -24,4 +24,4 @@ libloader_la_SOURCES = \
 CLEANFILES = sdksyms.c
 
 sdksyms.c: sdksyms.sh
-	$(srcdir)/sdksyms.sh $(top_srcdir) $(AM_CFLAGS) $(CFLAGS) $(INCLUDES)
+	CPP='$(CPP)' AWK='$(AWK)' $(srcdir)/sdksyms.sh $(top_srcdir) $(AM_CFLAGS) $(CFLAGS) $(INCLUDES)
diff --git a/hw/xfree86/loader/sdksyms.sh b/hw/xfree86/loader/sdksyms.sh
index 55f7206f2..05760106a 100755
--- a/hw/xfree86/loader/sdksyms.sh
+++ b/hw/xfree86/loader/sdksyms.sh
@@ -324,7 +324,7 @@ topdir=$1
 shift
 LC_ALL=C
 export LC_ALL
-cpp -DXorgLoader $@ sdksyms.c | awk -v topdir=$topdir '
+${CPP:-cpp} "$@" -DXorgLoader sdksyms.c | ${AWK:-awk} -v topdir=$topdir '
 BEGIN {
     sdk = 0;
     print("/*");
@@ -334,7 +334,7 @@ BEGIN {
     printf("/* topdir=%s */\n", topdir);
     print("_X_HIDDEN void *xorg_symbols[] = {");
 }
-/^# [0-9]+/ {
+/^# [0-9]+ "/ {
     #   Process text after a include in a relative path or when the
     # processed file has a basename matching $top_srcdir.
     #   Note that indexing starts at 1; 0 means no match, and there