From 71329a250b09dfacaca48fb69c69fe59eeb0c15a Mon Sep 17 00:00:00 2001
From: Mahmoud Al-Qudsi <mqudsi@neosmart.net>
Date: Sun, 4 Mar 2018 15:46:29 -0600
Subject: [PATCH] [cmake] Don't create installation directories that already
 exist

fish's cmake install routines were attempting to create system
directories that already existed, an operation for which the permissions
to do so may not be available (e.g. /usr/local/share/pkgconfig)

This commit first checks if a directory exists before creating it.
---
 cmake/Install.cmake | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/cmake/Install.cmake b/cmake/Install.cmake
index 03413c938..6aad5a4bc 100644
--- a/cmake/Install.cmake
+++ b/cmake/Install.cmake
@@ -54,7 +54,9 @@ ENDIF()
 # Define a function to help us create directories.
 FUNCTION(FISH_CREATE_DIRS)
   FOREACH(dir ${ARGV})
-    INSTALL(DIRECTORY DESTINATION ${dir})
+      IF(NOT EXISTS ${CMAKE_INSTALL_PREFIX}/${dir})
+        INSTALL(DIRECTORY DESTINATION ${dir})
+      ENDIF()
   ENDFOREACH(dir)
 ENDFUNCTION(FISH_CREATE_DIRS)