GUACAMOLE-935: Periods within regexes must be escaped if intended to match literal periods.
diff --git a/configure.ac b/configure.ac
index 6f8fd9b..0ec57aa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -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>
FREERDP_VERSION_FULL