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nixpkgs/pkgs/development/ocaml-modules/tcpip/makefile-no-opam.patch

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diff --git a/freestanding/Makefile b/freestanding/Makefile
index f22d220d..3e97b4c5 100644
--- a/freestanding/Makefile
+++ b/freestanding/Makefile
@@ -1,4 +1,6 @@
-PKG_CONFIG_PATH := $(shell opam config var prefix)/lib/pkgconfig
+ifneq (, $(shell command -v opam))
+ PKG_CONFIG_PATH ?= $(shell opam config var prefix)/lib/pkgconfig
+endif
EXISTS := $(shell PKG_CONFIG_PATH=$(PKG_CONFIG_PATH) pkg-config --exists ocaml-freestanding; echo $$?)