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-rw-r--r--lib/mkmf.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 93a548fc33..2fe9d08091 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -435,7 +435,7 @@ VPATH = $(srcdir)
CC = #{CONFIG["CC"]}
CFLAGS = #{CONFIG["CCDLFLAGS"]} #{CFLAGS} #{$CFLAGS}
-CPPFLAGS = -I$(hdrdir) -I#{CONFIG["includedir"]} #{$defs.join(" ")} #{CONFIG["CPPFLAGS"]} #{$CPPFLAGS}
+CPPFLAGS = -I$(hdrdir) -I$(srcdir) -I#{CONFIG["includedir"]} #{$defs.join(" ")} #{CONFIG["CPPFLAGS"]} #{$CPPFLAGS}
CXXFLAGS = $(CFLAGS)
DLDFLAGS = #{$DLDFLAGS} #{$LDFLAGS}
LDSHARED = #{CONFIG["LDSHARED"]} #{defflag}