diff --git a/.scripts/build.sh b/.scripts/build.sh
index 85e2438..8d989c4 100755
--- a/.scripts/build.sh
+++ b/.scripts/build.sh
@@ -3,6 +3,11 @@
 # -u: Treat unset variables as an error when substituting.
 # -x: Display expanded script commands
 
+if test "$CROSS_TOOL" = ""; then
+  CROSS_TOOL=m68k-atari-mint
+  export CROSS_TOOL
+fi
+
 make SHELL=/bin/bash
 make SHELL=/bin/bash DESTDIR="${INSTALL_DIR}" install
 
@@ -14,19 +19,10 @@ usr/sbin/zdump
 usr/sbin/zic
 "
 
-if file ${INSTALL_DIR}/usr/sbin/zic | grep a.out; then
-  TARGET=m68k-atari-mint
-elif file ${INSTALL_DIR}/usr/sbin/zic | grep ELF; then
-  TARGET=m68k-atari-mintelf
-else
-  echo "unknown file format" >&2
-  exit 2
-fi
-
 rm -f tz/*.o
 make -C tz DESTDIR="${INSTALL_DIR}" type=m68020 install
 cd "${INSTALL_DIR}"
-${TARGET}-strip $BINFILES
+${CROSS_TOOL}-strip $BINFILES
 tar cjf "${DEPLOY_DIR}/${ARCHIVE_NAME}-020.${DEPLOY_ARCHIVE} $BINFILES usr/share/zoneinfo
 rm -f $BINFILES
 cd -
@@ -34,7 +30,7 @@ cd -
 rm -f tz/*.o
 make -C tz DESTDIR="${INSTALL_DIR}" type=coldfire install
 cd "${INSTALL_DIR}"
-${TARGET}-strip $BINFILES
+${CROSS_TOOL}-strip $BINFILES
 tar cjf "${DEPLOY_DIR}/${ARCHIVE_NAME}-v4e.${DEPLOY_ARCHIVE} $BINFILES usr/share/zoneinfo
 rm -f $BINFILES
 cd -
@@ -42,6 +38,6 @@ cd -
 rm -f tz/*.o
 make -C tz DESTDIR="${INSTALL_DIR}" type=m68000 install
 cd "${INSTALL_DIR}"
-${TARGET}-strip $BINFILES
+${CROSS_TOOL}-strip $BINFILES
 tar cjf "${DEPLOY_DIR}/${ARCHIVE_NAME}-000.${DEPLOY_ARCHIVE} $BINFILES usr/share/zoneinfo
 cd -