diff -uNr fltk-1.3.5/src/Fl_x.cxx fltk-1.3.5.mod/src/Fl_x.cxx
--- fltk-1.3.5/src/Fl_x.cxx	2019-03-03 10:40:23.000000000 +0200
+++ fltk-1.3.5.mod/src/Fl_x.cxx	2019-05-19 17:30:59.885700620 +0300
@@ -758,8 +758,8 @@
 #endif
 
 #if USE_XRANDR
-  void *libxrandr_addr = dlopen("libXrandr.so.2", RTLD_LAZY);
-  if (!libxrandr_addr)  libxrandr_addr = dlopen("libXrandr.so", RTLD_LAZY);
+  void *libxrandr_addr = dlopen("libXrandr.so", RTLD_LAZY);
+
   if (libxrandr_addr) {
     int error_base;
     typedef Bool (*XRRQueryExtension_type)(Display*, int*, int*);
diff -uNr fltk-1.3.5/src/screen_xywh.cxx fltk-1.3.5.mod/src/screen_xywh.cxx
--- fltk-1.3.5/src/screen_xywh.cxx	2019-03-03 10:40:23.000000000 +0200
+++ fltk-1.3.5.mod/src/screen_xywh.cxx	2019-05-19 17:30:32.556510789 +0300
@@ -176,8 +176,8 @@
 
   static XRRSizes_type XRRSizes_f = NULL;
   if (!XRRSizes_f) {
-    void *libxrandr_addr = dlopen("libXrandr.so.2", RTLD_LAZY);
-    if (!libxrandr_addr) libxrandr_addr = dlopen("libXrandr.so", RTLD_LAZY);
+    void *libxrandr_addr = dlopen("libXrandr.so", RTLD_LAZY);
+
 #   ifdef __APPLE_CC__ // allows testing on Darwin + X11
     if (!libxrandr_addr) libxrandr_addr = dlopen("/opt/X11/lib/libXrandr.dylib", RTLD_LAZY);
 #   endif