@echo "#ifndef __GHCAUTOCONF_H__" >$@
@echo "#define __GHCAUTOCONF_H__" >>$@
# Turn '#define PACKAGE_FOO "blah"' into '/* #undef PACKAGE_FOO */'.
@echo "#ifndef __GHCAUTOCONF_H__" >$@
@echo "#define __GHCAUTOCONF_H__" >>$@
# Turn '#define PACKAGE_FOO "blah"' into '/* #undef PACKAGE_FOO */'.