commit a82a98dd6699f8aebe68a905498d89ec07c73563
Author: Kevin Zheng <kevinz5000@gmail.com>
Date:   Mon May 25 11:29:33 2020 -0700

    lang/ghc: Enable USE_PTHREAD_FOR_ITIMER

diff --git a/lang/ghc/files/patch-rts_posix_Itimer.c b/lang/ghc/files/patch-rts_posix_Itimer.c
new file mode 100644
index 000000000000..376abdfba1d3
--- /dev/null
+++ b/lang/ghc/files/patch-rts_posix_Itimer.c
@@ -0,0 +1,11 @@
+--- rts/posix/Itimer.c.orig	2020-05-25 18:21:14 UTC
++++ rts/posix/Itimer.c
+@@ -48,7 +48,7 @@
+ #define USE_PTHREAD_FOR_ITIMER
+ #endif
+ 
+-#if defined(freebsd_HOST_OS) && defined(THREADED_RTS)
++#if defined(freebsd_HOST_OS)
+ #define USE_PTHREAD_FOR_ITIMER
+ #endif
+