STD='make -f Makefile.am LEX=flex YACC="bison -y" srcdir=.'
(cd Zend && eval "$STD zend-parser.c zend-scanner.c zend-scanner-cc.cc")
-eval "$STD configuration-parser.c configuration-scanner.c"
-(cd ext/standard && eval "$STD parsedate.c")
+
+files="Makefile ext/standard/Makefile"
+sh build/fastgen.sh . yes $files
+
+cat > config_vars.mk <<EOF
+LEX=flex
+YACC=bison -y
+EOF
+
+make configuration-parser.c configuration-scanner.c
+(cd ext/standard && make parsedate.c)
+
+rm config_vars.mk $files
+
+