diff --git a/builds/unix/configure.raw b/builds/unix/configure.raw
index e7a4026..d756d2b 100644
--- a/builds/unix/configure.raw
+++ b/builds/unix/configure.raw
@@ -40,7 +40,7 @@
 # checks for native programs to generate building tool
 
 if test ${cross_compiling} = yes; then
-  AC_CHECK_PROG(CC_BUILD, ${build}-gcc, ${build-gcc})
+  AC_CHECK_PROG(CC_BUILD, ${build}-gcc, ${build}-gcc)
   test -z "${CC_BUILD}" && AC_CHECK_PROG(CC_BUILD, gcc, gcc)
   test -z "${CC_BUILD}" && AC_CHECK_PROG(CC_BUILD, cc, cc, , , /usr/ucb/cc)
   test -z "${CC_BUILD}" && AC_MSG_ERROR([cannot find native C compiler])