More ticket #583: autoconf support for Intel IPP

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@2232 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/build.mak.in b/build.mak.in
index 57ee2c6..d0fea15 100644
--- a/build.mak.in
+++ b/build.mak.in
@@ -33,6 +33,8 @@
 APP_THIRD_PARTY_LIB_FILES += $(PJ_DIR)/third_party/lib/libportaudio-$(LIB_SUFFIX)
 endif
 
+# Additional flags
+@ac_build_mak_vars@
 
 # CFLAGS, LDFLAGS, and LIBS to be used by applications
 export PJDIR := @ac_pjdir@