From c55a2adbbafb4066561d3aae9410b158ad5d9950 Mon Sep 17 00:00:00 2001
From: Gleb Popov <6yearold@gmail.com>
Date: Wed, 9 Jun 2021 21:17:12 +0300
Subject: Pass -DLIBICONV_PLUG when building base library on FreeBSD.

If libiconv is installed from packages on the build machine, there is a high
chance that the build system will pick up /usr/local/include/iconv.h instead
of base /usr/include/iconv.h

This additional preprocessor define makes package's libiconv header compatible
with system one, fixing the build.

Closes issue #19958
---
 libraries/base/base.cabal | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libraries/base/base.cabal b/libraries/base/base.cabal
index 85714bf05f..a43055c11a 100644
--- a/libraries/base/base.cabal
+++ b/libraries/base/base.cabal
@@ -440,6 +440,12 @@ Library
             System.CPUTime.Posix.RUsage
             System.CPUTime.Unsupported
 
+    -- The Ports framework always passes this flag when building software that
+    -- uses iconv to make iconv from Ports compatible with iconv from the base system
+    -- See /usr/ports/Mk/Uses/iconv.mk
+    if os(freebsd)
+        cc-options: -DLIBICONV_PLUG
+
     -- We need to set the unit id to base (without a version number)
     -- as it's magic.
     ghc-options: -this-unit-id base
-- 
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