fix error in OSMESA_LIB_NAME line
diff --git a/configs/default b/configs/default
index 8a36980..6dcfa7b 100644
--- a/configs/default
+++ b/configs/default
@@ -39,7 +39,7 @@
 GLU_LIB_NAME = lib$(GLU_LIB).so
 GLUT_LIB_NAME = lib$(GLUT_LIB).so
 GLW_LIB_NAME = lib$(GLW_LIB).so
-OSMESA_LIB_NAME = lib$(OSMesa).so
+OSMESA_LIB_NAME = lib$(OSMESA_LIB).so
 
 
 # Optional assembly language optimization files for libGL