user run the tests using a shell other than the default /bin/sh
by using, e.g., make check TESTS_SHELL=/bin/bash. Thanks to
Tom Lane <tgl@sss.pgh.pa.us> for suggesting this.
TESTS_ENVIRONMENT = MH_OBJ_DIR=@abs_builddir@ \
MH_TEST_DIR=@abs_builddir@/test/testdir \
auxexecdir=$(auxexecdir) bindir=$(bindir) \
- mandir=$(mandir) sysconfdir=$(sysconfdir)
+ mandir=$(mandir) sysconfdir=$(sysconfdir) \
+ $(TESTS_SHELL) ## Keep at end of TESTS_ENVIRONMENT.
##
## Important note: the "cleanup" test should always be last
##