-COMMAND echo "/* Automatically generated file - DO NOT EDIT */" > "${about}.tmp"
-COMMAND echo "static const char psz_license[] =" >> "${about}.tmp"
-COMMAND cat ${CMAKE_SOURCE_DIR}/COPYING | sed s/\"/''/g | awk "{ print \"\\\"\"$0\"\\\\n\\\"\" }" >> "${about}.tmp"
-COMMAND echo ";" >> "${about}.tmp"
-COMMAND echo "static const char psz_thanks[] =" >> "${about}.tmp"
-COMMAND grep -v '$$Id:' ${CMAKE_SOURCE_DIR}/THANKS | sed "s/\"/''/g" | awk "{ print \"\\\"\"$0\"\\\\n\\\"\" }"|sed "s/\"<.*.> \"//" >> "${about}.tmp"
-COMMAND echo ";" >> "${about}.tmp"
-COMMAND echo "static const char psz_authors[] =" >> "${about}.tmp"
-COMMAND grep N: ${CMAKE_SOURCE_DIR}/AUTHORS | cut -d "\ " -f 2- | sed "s/\"/''/g" | awk "{ print \"\\\"\"$0\"\\\\n\\\"\" }" >> "${about}.tmp"
-COMMAND echo ";" >> "${about}.tmp"
-COMMAND mv -f -- "${about}.tmp" "${about}"
+COMMAND sh -c "echo '/* Automatically generated file - DO NOT EDIT */' > ${about}.tmp"
+COMMAND sh -c "echo 'static const char psz_license[] =' >> ${about}.tmp"
+COMMAND sh -c "cat ${CMAKE_SOURCE_DIR}/COPYING | sed s/\\\"/''/g | awk '{ print \"\\\"\"$0\"\\\\n\\\"\" }' >> ${about}.tmp"
+COMMAND sh -c "echo ';' >> ${about}.tmp"
+COMMAND sh -c "echo 'static const char psz_thanks[] =' >> ${about}.tmp"
+COMMAND sh -c "grep -v '$$Id:' ${CMAKE_SOURCE_DIR}/THANKS | sed 's/\"/''/g' | awk '{ print \"\\\"\"$0\"\\\\n\\\"\" }'|sed 's/\"<.*.> \"//' >> ${about}.tmp"
+COMMAND sh -c "echo ';' >> ${about}.tmp"
+COMMAND sh -c "echo 'static const char psz_authors[] =' >> ${about}.tmp"
+COMMAND sh -c "grep N: ${CMAKE_SOURCE_DIR}/AUTHORS | cut -d '\ ' -f 2- | sed 's/\"/''/g' | awk '{ print \"\\\"\"$0\"\\\\n\\\"\" }' >> ${about}.tmp"
+COMMAND sh -c "echo ';' >> ${about}.tmp"
+COMMAND sh -c "mv -f -- ${about}.tmp ${about}"