Description: improved support for build flags
 The first change makes linking makeHeader use the same CPP/CXX/LD flags as the
 rest of the sources.
 The second change stops btyacc/Makefile from ignoring CFLAGS from the
 environment.
 Both changes help compile/link with default hardening flags.
Author: Damyan Ivanov <dmn@debian.org>

--- a/builds/posix/Makefile.in
+++ b/builds/posix/Makefile.in
@@ -572,7 +572,7 @@ MAKE_HEADER_Src = $(addprefix $(SRC_ROOT
 MAKE_HEADER_Bin = ./makeHeader
 
 $(INCLUDE_DEST)/ibase.h: $(SRC_IBASE_ExtraFiles)
-	$(STATICEXE_LINK) -o $(MAKE_HEADER_Bin) $(MAKE_HEADER_Src)
+	$(STATICEXE_LINK) $(EXE_LINK_OPTIONS) $(LINK_OPTS) $(CPPFLAGS) -o $(MAKE_HEADER_Bin) $(MAKE_HEADER_Src)
 	$(CP) $^ .
 	$(MAKE_HEADER_Bin) <ibase.h >$@
 	$(RM) -f ibase.h
--- a/extern/btyacc/Makefile
+++ b/extern/btyacc/Makefile
@@ -12,7 +12,7 @@ HDRS	      = defs.h mstring.h
 # across all of our supported compilers/platforms.
 
 # Vanilla CFLAGS
-CFLAGS=
+CFLAGS?=
 
 # No LDFLAGS
 #LDFLAGS=