force 32-bit mode under Solaris/amd64 or GMP will fail during building as our GCC (still for unknown reasons) uses 32-bit mode by default on this platform

gmp/gmp.spec

@@ -33,7 +33,7 @@ Class:        BASE
 Group:        Algorithm
 License:      LGPL
 Version:      4.2.1
-Release:      20060505
+Release:      20061013
 
 #   list of sources
 Source0:      ftp://ftp.gnu.org/gnu/gmp/gmp-%{version}.tar.gz
@@ -74,7 +74,8 @@ AutoReqProv:  no
     export CC="%{l_cc}"
     export CFLAGS="%{l_cflags -O}"
     case "%{l_platform -p}" in
-        sparc*-* ) CFLAGS="$CFLAGS -DNO_ASM" ;;
+        sparc*-*       ) CFLAGS="$CFLAGS -DNO_ASM" ;;
+        amd64-solaris* ) CFLAGS="$CFLAGS -DNO_ASM"; export ABI=32 ;;
     esac
     ./configure \
         --prefix=%{l_prefix} \