Append %_bindir to PATH only if %_prefix != /usr.

scripts/gccnewlib/gccnewlib.add

@@ -201,7 +201,9 @@ chmod +x brp-rtems-compress
 %if %build_libgcj
   optargs="--enable-libgcj"
 %endif
+%if "%{_prefix}" != "/usr"
   export PATH="%{_bindir}:${PATH}"
+%endif
   ../gcc-%{gcc_version}/configure \
     --prefix=%{_prefix} \
     --bindir=%{_bindir} \

scripts/gdb/gdb.add

@@ -86,7 +86,9 @@ cd ..
 
   mkdir -p build
   cd build
+%if "%{_prefix}" != "/usr"
   export PATH="%{_bindir}:${PATH}"
+%endif
   CFLAGS="$RPM_OPT_FLAGS" \
   ../gdb-%{gdb_version}/configure \
     --build=%_build --host=%_host \