require GCC, Forte doesn't like SCM_DEBUG_TYPING_STRICTNESS=

guile/guile.spec

@@ -41,7 +41,7 @@ Source0:      ftp://ftp.gnu.org/gnu/guile/guile-%{version}.tar.gz
 #   build information
 Prefix:       %{l_prefix}
 BuildRoot:    %{l_buildroot}
-BuildPreReq:  OpenPKG, openpkg >= 20020206, make, texinfo
+BuildPreReq:  OpenPKG, openpkg >= 20020206, make, texinfo, gcc
 PreReq:       OpenPKG, openpkg >= 20020206, libtool
 AutoReq:      no
 AutoReqProv:  no
@@ -54,6 +54,8 @@ AutoReqProv:  no
     %setup -q
 
 %build
+    # GNUC on sparc requires -DSCM_DEBUG_TYPING_STRICTNESS=1
+    # Forte C on sparc breaks with -DSCM_DEBUG_TYPING_STRICTNESS=1
     opt=""
     case "%{l_target}" in
         *-solaris* )