From c8bfae0819a1343bd435d7a6e22671594ecb5e5d Mon Sep 17 00:00:00 2001
From: Red Davies <red@infect.me>
Date: Tue, 5 Nov 2019 20:28:30 -0500
Subject: [PATCH] icu: bugfix #71142 - Fixes icu-config reporting bad location

---
 pkgs/development/libraries/icu/base.nix | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/pkgs/development/libraries/icu/base.nix b/pkgs/development/libraries/icu/base.nix
index 0a8cb7d4684..47ca63fca99 100644
--- a/pkgs/development/libraries/icu/base.nix
+++ b/pkgs/development/libraries/icu/base.nix
@@ -63,10 +63,16 @@ let
     # remove dependency on bootstrap-tools in early stdenv build
     postInstall = stdenv.lib.optionalString stdenv.isDarwin ''
       sed -i 's/INSTALL_CMD=.*install/INSTALL_CMD=install/' $out/lib/icu/${version}/pkgdata.inc
-    '' + ''
+    '' + (let
+      replacements = [
+        { from = "\${prefix}/include"; to = "${placeholder "dev"}/include"; } # --cppflags-searchpath
+        { from = "\${pkglibdir}/Makefile.inc"; to = "${placeholder "dev"}/lib/icu/Makefile.inc"; } # --incfile
+        { from = "\${pkglibdir}/pkgdata.inc"; to = "${placeholder "dev"}/lib/icu/pkgdata.inc"; } # --incpkgdatafile
+      ];
+    in ''
       substituteInPlace "$dev/bin/icu-config" \
-        --replace \''${pkglibdir}/Makefile.inc "$dev/lib/icu/Makefile.inc"
-    '';
+        ${lib.concatMapStringsSep " " (r: "--replace '${r.from}' '${r.to}'") replacements}
+    '');
 
     postFixup = ''moveToOutput lib/icu "$dev" '';
   };