diff --git a/share/mk/bsd.README b/share/mk/bsd.README
--- a/share/mk/bsd.README
+++ b/share/mk/bsd.README
@@ -701,6 +701,9 @@
 
 PLAIN_TESTS_CXX	The names of the plain (legacy) test programs to build.
 
+PLAIN_TESTS_PORCH	The names of the plain (legacy) porch(1)-based
+		test programs to build.
+
 PLAIN_TESTS_SH	The names of the plain (legacy) test programs to build.
 
 TAP_PERL_INTERPRETER
diff --git a/share/mk/plain.test.mk b/share/mk/plain.test.mk
--- a/share/mk/plain.test.mk
+++ b/share/mk/plain.test.mk
@@ -43,6 +43,17 @@
 .endfor
 .endif
 
+.if !empty(PLAIN_TESTS_PORCH)
+SCRIPTS+= ${PLAIN_TESTS_PORCH:S/$/.orch/}
+_TESTS+= ${PLAIN_TESTS_PORCH}
+.for _T in ${PLAIN_TESTS_PORCH}
+SCRIPTSDIR_${_T}.orch= ${TESTSDIR}
+
+TEST_INTERFACE.${_T}= plain
+TEST_METADATA.${_T}+=	required_programs="porch"
+.endfor
+.endif
+
 .if !empty(PLAIN_TESTS_SH)
 SCRIPTS+= ${PLAIN_TESTS_SH}
 _TESTS+= ${PLAIN_TESTS_SH}