diff -r 270dba8bf87b -r 69fe0b81e951 targets/XSD_toolchain_gcc
--- a/targets/XSD_toolchain_gcc	Mon Apr 18 18:51:59 2016 +0300
+++ b/targets/XSD_toolchain_gcc	Mon Apr 18 18:56:51 2016 +0300
@@ -1,5 +1,5 @@
 
           <xsd:attribute name="Compiler" type="xsd:string" use="optional" default="gcc"/>
-          <xsd:attribute name="CFLAGS" type="xsd:string" use="required"/>
+          <xsd:attribute name="CFLAGS" type="xsd:string" use="optional" default=""/>
           <xsd:attribute name="Linker" type="xsd:string" use="optional" default="gcc"/>
-          <xsd:attribute name="LDFLAGS" type="xsd:string" use="required"/>
+          <xsd:attribute name="LDFLAGS" type="xsd:string" use="optional" default=""/>