From 2f3dcce640d9783de4b3d610a7c1914cb1527114 Mon Sep 17 00:00:00 2001
From: Kristian Evers <kristianevers@gmail.com>
Date: Sun, 28 Aug 2022 11:32:23 +0200
Subject: [PATCH] Avoid using upper case project name in doc install dir
 (#3299)

Closes #3296

Co-authored-by: Mike Taves <mwtoews@gmail.com>
---
 CMakeLists.txt | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 775cd011d5..be05dd53c3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -291,7 +291,20 @@ link_directories(${CMAKE_LIBRARY_OUTPUT_DIRECTORY})
 # Installation
 ################################################################################
 include(ProjInstallPath)
+
+# By default GNUInstallDirs will use the upper case project name
+# for CMAKE_INSTALL_DOCDIR, resulting in something like share/doc/PROJ
+# instead of share/doc/proj which historically have been the path used
+# by the project. 
+# Here force the use of a lower case project name and reset after
+# GNUInstallDirs has done its thing
+set(PROJECT_NAME_ORIGINAL "${PROJECT_NAME}")
+string(TOLOWER "${PROJECT_NAME}" PROJECT_NAME)
+
 include(GNUInstallDirs)
+
+set(PROJECT_NAME "${PROJECT_NAME_ORIGINAL}")
+
 set(PROJ_DATA_PATH "${CMAKE_INSTALL_FULL_DATADIR}/proj")
 
 ################################################################################