GUACAMOLE-935: Periods within regexes must be escaped if intended to match literal periods.
diff --git a/ b/
index 6f8fd9b..0ec57aa 100644
--- a/
+++ b/
@@ -589,7 +589,7 @@
     # manually free all data associated with the rdpBitmap, even data which
     # was not allocated by the implementation.
     AC_MSG_CHECKING([whether Bitmap_Free() frees the rdpBitmap and its image data])
-    AC_EGREP_CPP([\"2.0.0-dev\"], [
+    AC_EGREP_CPP([\"2\\.0\\.0-dev\"], [
         #include <freerdp/version.h>