commit 87b799ba07070cfd4ce574545819d3729deb152b
Author:     ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
AuthorDate: Mon Aug 31 12:34:37 2020 +0200
Commit:     ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
CommitDate: Mon Aug 31 12:35:25 2020 +0200

    make + macOS: further fix to the construction of fltk-config

 CMake/options.cmake | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git CMake/options.cmake CMake/options.cmake
index d6184fe..0153a19 100644
--- CMake/options.cmake
+++ CMake/options.cmake
@@ -56,7 +56,9 @@ endif (UNIX)
 if (APPLE)
   option (OPTION_APPLE_X11 "use X11" OFF)
   option (OPTION_APPLE_SDL "use SDL" OFF)
-  list (APPEND FLTK_CFLAGS "-isysroot ${CMAKE_OSX_SYSROOT}")
+  if (CMAKE_OSX_SYSROOT)
+    list (APPEND FLTK_CFLAGS "-isysroot ${CMAKE_OSX_SYSROOT}")
+  endif (CMAKE_OSX_SYSROOT)
 endif (APPLE)
 
 # find X11 libraries and headers
@@ -470,7 +472,7 @@ if (X11_Xft_FOUND AND OPTION_USE_PANGO)
     list (APPEND FLTK_LDLIBS -lpango-1.0 -lpangoxft-1.0 -lgobject-2.0)
     if (APPLE)
       get_filename_component(PANGO_L_PATH ${HAVE_LIB_PANGO} PATH)
-      set (LDFLAGS "${LDFLAGS} -isysroot ${CMAKE_OSX_SYSROOT} -L${PANGO_L_PATH}")
+      set (LDFLAGS "${LDFLAGS} -L${PANGO_L_PATH}")
     endif (APPLE)
   else(PANGOXFT_FOUND)