gentoo-overlay/media-sound/csound/files/csound-5.17.11-no-fltk-gl.patch

--- Csound5.17.11/frontends/CsoundAC/CMakeLists.txt
+++ Csound5.17.11/frontends/CsoundAC/CMakeLists.txt
@@ -7,6 +7,7 @@
 
 find_package(Boost)
 find_library(MUSICXML_LIBRARY musicxml2)
+set(FLTK_SKIP_OPENGL true)
 find_package(FLTK)
 find_package(SWIG)
 find_package(PythonLibs)
--- Csound5.17.11/InOut/CMakeLists.txt
+++ Csound5.17.11/InOut/CMakeLists.txt
@@ -56,6 +56,7 @@
     find_library(COREAUDIO_LIBRARY CoreAudio)
 endif()
 if(USE_FLTK OR BUILD_VIRTUAL_KEYBOARD)
+    set(FLTK_SKIP_OPENGL true)
     find_package(FLTK)
 endif()