Add a system method for obtaining GL dependency on Linux OS

mesonbuild/dependencies/ui.py

@@ -45,12 +45,20 @@ class GLDependencySystem(SystemDependency):
             self.link_args = ['-framework', 'OpenGL']
             # FIXME: Detect version using self.clib_compiler
             return
-        if self.env.machines[self.for_machine].is_windows():
+        elif self.env.machines[self.for_machine].is_windows():
             self.is_found = True
             # FIXME: Use self.clib_compiler.find_library()
             self.link_args = ['-lopengl32']
             # FIXME: Detect version using self.clib_compiler
             return
+        else:
+            links = self.clib_compiler.find_library('GL', environment, [])
+            has_header = self.clib_compiler.has_header('GL/gl.h', '', environment)[0]
+            if links and has_header:
+                self.is_found = True
+                self.link_args = links
+            elif links:
+                raise DependencyException('Found GL runtime library but no development header files')
 
 class GnuStepDependency(ConfigToolDependency):