epm repack-rpm: try install eepm-rpm-build

bin/epm-repack-rpm

@@ -104,6 +104,25 @@ EOF
     remove_on_exit "$HOME/.rpmmacros"
 }
 
+# will set RPMBUILD
+__try_install_eepm_rpmbuild()
+{
+    RPMBUILD=/usr/bin/rpmbuild
+    [ -x "$RPMBUILD" ] && return
+
+    RPMBUILD=/usr/bin/eepm-rpmbuild
+    if [ ! -x $RPMBUILD ] ; then
+        epm install eepm-rpm-build
+    fi
+
+    if [ -x $RPMBUILD ] ; then
+        warning "will use eepm-rpmbuild for rpm packing"
+        export EPM_RPMBUILD=$RPMBUILD
+        return
+    fi
+
+    RPMBUILD=/usr/bin/rpmbuild
+}
 
 # will fill repacked_pkgs var
 __epm_repack_to_rpm()
@@ -113,12 +132,10 @@ __epm_repack_to_rpm()
     # Note: install epm-repack for static (package based) dependencies
     assure_exists alien || fatal
 
-    RPMBUILD=/usr/bin/eepm-rpmbuild
+    # will set RPMBUILD
+    __try_install_eepm_rpmbuild
 
-    if [ -x $RPMBUILD ] ; then
-        warning "will use eepm-rpmbuild for rpm packing"
-        export EPM_RPMBUILD=$RPMBUILD
-    else
+    if [ ! -x $RPMBUILD ] ; then
         RPMBUILD=/usr/bin/rpmbuild
         # TODO: check for all systems
         case $PKGFORMAT in