Fix failure of parallel test suite. This is due to
misspecification of the test suite, which requires
first compiling $(check_PROGRAMS) and only then
running $(TESTS):

* check-am: all-am
*         $(MAKE) $(AM_MAKEFLAGS) $(check_PROGRAMS)
*         $(MAKE) $(AM_MAKEFLAGS) check-TESTS

The old build system never specified $(TESTS) and
erroneously made the check target depend on the
two tests.
See also: https://bugs.gentoo.org/show_bug.cgi?id=603352

--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -12,22 +12,7 @@
 rfftw_test_LDADD = $(RFFTWDIR)/lib@FFTW_PREFIX@rfftw.la \
                    $(FFTWDIR)/lib@FFTW_PREFIX@fftw.la
 
-check: fftw-tests rfftw-tests 
+TESTS = myfftwtests.sh myrfftwtests.sh
 
-fftw-tests: fftw_test
-	./fftw_test -p 0
-	./fftw_test -x 128 -a 0
-	./fftw_test -x 32 -a 2
-	./fftw_test -x 100 -r 0
-	@echo "--------------------------------------------------------------"
-	@echo "         FFTW complex-complex transforms passed tests!"
-	@echo "--------------------------------------------------------------"
-
-rfftw-tests: rfftw_test
-	./rfftw_test -p 0
-	./rfftw_test -x 128 -a 0
-	./rfftw_test -x 32 -a 2
-	./rfftw_test -x 100 -r 0
-	@echo "--------------------------------------------------------------"
-	@echo "          RFFTW real-complex transforms passed tests!"
-	@echo "--------------------------------------------------------------"
+TEST_EXTENSIONS = .sh
+SH_LOG_COMPILER = $(SHELL)
--- a/tests/myfftwtests.sh
+++ b/tests/myfftwtests.sh
@@ -0,0 +1,4 @@
+./fftw_test -p 0 && \
+./fftw_test -x 128 -a 0 && \
+./fftw_test -x 32 -a 2 && \
+./fftw_test -x 100 -r 0
--- a/tests/myrfftwtests.sh
+++ b/tests/myrfftwtests.sh
@@ -0,0 +1,4 @@
+./rfftw_test -p 0 && \
+./rfftw_test -x 128 -a 0 && \
+./rfftw_test -x 32 -a 2 && \
+./rfftw_test -x 100 -r 0
--- a/threads/fftw_threads_test_check.sh
+++ b/threads/fftw_threads_test_check.sh
@@ -0,0 +1,4 @@
+./fftw_threads_test 1 -x 100 -r 0 && \
+./fftw_threads_test 2 -x 100 -r 0 && \
+./fftw_threads_test 3 -x 100 -r 0 && \
+./fftw_threads_test 10 -x 100 -r 0
--- a/threads/Makefile.am
+++ b/threads/Makefile.am
@@ -78,29 +78,7 @@
 # incorrect.  Just disable autoheader
 AUTOHEADER=echo
 
-check: @FFTW_THREADS_PROGLIST@
-	@set fnord $(MAKEFLAGS); amf=$$2; \
-        list='@FFTW_THREADS_PROGLIST@'; for prog in $$list; do \
-          target="$$prog""-check"; \
-          echo "Making $$target"; \
-          ($(MAKE) $$target) \
-           || case "$$amf" in *=*) exit 1;; *k*) fail=yes;; *) exit 1;; esac; \
-        done && test -z "$$fail"
+TESTS = fftw_threads_test_check.sh rfftw_threads_test_check.sh
 
-fftw_threads_test-check: fftw_threads_test
-	./fftw_threads_test 1 -x 100 -r 0
-	./fftw_threads_test 2 -x 100 -r 0
-	./fftw_threads_test 3 -x 100 -r 0
-	./fftw_threads_test 10 -x 100 -r 0
-	@echo "--------------------------------------------------------------"
-	@echo "    FFTW complex-complex threads transforms passed tests!"
-	@echo "--------------------------------------------------------------"
-
-rfftw_threads_test-check: rfftw_threads_test
-	./rfftw_threads_test 1 -x 100 -r 0
-	./rfftw_threads_test 2 -x 100 -r 0
-	./rfftw_threads_test 3 -x 100 -r 0
-	./rfftw_threads_test 10 -x 100 -r 0
-	@echo "--------------------------------------------------------------"
-	@echo "     RFFTW real-complex threads transforms passed tests!"
-	@echo "--------------------------------------------------------------"
+TEST_EXTENSIONS = .sh
+SH_LOG_COMPILER = $(SHELL)
--- a/threads/rfftw_threads_test_check.sh
+++ b/threads/rfftw_threads_test_check.sh
@@ -0,0 +1,4 @@
+./rfftw_threads_test 1 -x 100 -r 0 && \
+./rfftw_threads_test 2 -x 100 -r 0 && \
+./rfftw_threads_test 3 -x 100 -r 0 && \
+./rfftw_threads_test 10 -x 100 -r 0