From edf7510dda6b62905920fbf3a2fe01abbeab920e Mon Sep 17 00:00:00 2001
From: Matthias Melcher <github@matthiasm.com>
Date: Sun, 13 Nov 2022 20:16:54 +0100
Subject: Make building Fluid optional. (#539)

---
 CMake/FLTK-Functions.cmake | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'CMake/FLTK-Functions.cmake')

diff --git a/CMake/FLTK-Functions.cmake b/CMake/FLTK-Functions.cmake
index 460f89fbf..009653721 100644
--- a/CMake/FLTK-Functions.cmake
+++ b/CMake/FLTK-Functions.cmake
@@ -22,6 +22,12 @@
 # USAGE: FLTK_RUN_FLUID TARGET_NAME "FLUID_SOURCE [.. FLUID_SOURCE]"
 
 function (FLTK_RUN_FLUID TARGET SOURCES)
+
+  if (NOT FLTK_FLUID_EXECUTABLE)
+    message (WARNING "Not building ${SOURCES}. FLUID executable not found.")
+    return ()
+  endif (NOT FLTK_FLUID_EXECUTABLE)
+
   set (CXX_FILES)
   foreach (src ${SOURCES})
     if ("${src}" MATCHES "\\.fl$")
@@ -36,6 +42,7 @@ function (FLTK_RUN_FLUID TARGET SOURCES)
     endif ("${src}" MATCHES "\\.fl$")
   endforeach ()
   set (${TARGET} ${CXX_FILES} PARENT_SCOPE)
+
 endfunction (FLTK_RUN_FLUID TARGET SOURCES)
 
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