+# EXTRA_CFLAGS
+# You can specify extra flags to be passed to gcc here.
+#
+# One flag you might want to pass here is
+#
+# -DPERL4CAML_REFCOUNTING_EXPERIMENTAL=1
+#
+# which will turn on experimental support for reference counting.
+# Without this none of the Perl structures that you allocate will get
+# freed. With this we try to map Perl's reference counting onto
+# OCaml's garbage collection by using finalizers. Although the
+# feature is marked "EXPERIMENTAL", I have fixed most of the bugs
+# and it's now turned on by default.
+
+#EXTRA_CFLAGS :=
+EXTRA_CFLAGS := -DPERL4CAML_REFCOUNTING_EXPERIMENTAL=1
+#EXTRA_CFLAGS := -I/Users/rich/OCaml/lib/ocaml/std-lib
+#EXTRA_CFLAGS := -g
+
+# DYNALOADER_HACK
+# XXX Hack required by ocamlopt, and sometimes ocamlc.
+# To work out what this should be, try:
+# `perl -MExtUtils::Embed -e ldopts'
+
+DYNALOADER_HACK := $(shell perl -MExtUtils::Embed -e ldopts | egrep -o '/[^[:space:]]*DynaLoader.a')
+#DYNALOADER_HACK := /usr/lib/perl/5.8/auto/DynaLoader/DynaLoader.a
+#DYNALOADER_HACK := /System/Library/Perl/5.8.1/darwin-thread-multi-2level/auto/DynaLoader/DynaLoader.a
+