1 diff --git a/autoconf/variables.mak.in b/autoconf/variables.mak.in
2 index b67e467..6022434 100644
3 --- a/autoconf/variables.mak.in
4 +++ b/autoconf/variables.mak.in
5 @@ -65,7 +65,7 @@ DRVLIBS = @PTHREAD_LFLAGS@ @DRVLIBS@
7 X_EXTRA_LIBS = @X_EXTRA_LIBS@
9 -CPPFLAGS = @CPPFLAGS@ -I$(topdir)/include $(EXTRAINCS)
10 +CPPFLAGS = -I$(topdir)/include @CPPFLAGS@ $(EXTRAINCS)
11 CFLAGS = $(CPPFLAGS) @CFLAGS@ @PTHREAD_CFLAGS@
12 CXXFLAGS = $(CPPFLAGS) @CXXFLAGS@ @PTHREAD_CFLAGS@