piglit failed to build in a bulk due to a missing dependency. Patch below fixed the build for me.
[3320/4182] cd /tmp/pobj/piglit-20210128/build-amd64/target_api/gl/tests/spec/ext_external_objects && /usr/local/bin/glslangValidator -V /tmp/pobj/piglit-20210128/piglit-83173d9536c9f5e1571efe5933d210466ec255b8/tests/spec/ext_external_objects/vk_blue.vert -o /tmp/pobj/piglit-20210128/piglit-83173d9536c9f5e1571efe5933d210466ec255b8/tests/spec/ext_external_objects/vk_blue.vert.spv FAILED: /tmp/pobj/piglit-20210128/piglit-83173d9536c9f5e1571efe5933d210466ec255b8/tests/spec/ext_external_objects/vk_blue.vert.spv cd /tmp/pobj/piglit-20210128/build-amd64/target_api/gl/tests/spec/ext_external_objects && /usr/local/bin/glslangValidator -V /tmp/pobj/piglit-20210128/piglit-83173d9536c9f5e1571efe5933d210466ec255b8/tests/spec/ext_external_objects/vk_blue.vert -o /tmp/pobj/piglit-20210128/piglit-83173d9536c9f5e1571efe5933d210466ec255b8/tests/spec/ext_external_objects/vk_blue.vert.spv /bin/sh: /usr/local/bin/glslangValidator: not found ninja: build stopped: subcommand failed. *** Error 1 in graphics/piglit (/usr/ports/devel/cmake/cmake.port.mk:36 'do-build': @cd /tmp/pobj/piglit-20210128/build-amd64 && exec /usr/b...) *** Error 2 in graphics/piglit (/usr/ports/infrastructure/mk/bsd.port.mk:2943 '/tmp/pobj/piglit-20210128/build-amd64/.build_done': @cd /usr/...) *** Error 2 in graphics/piglit (/usr/ports/infrastructure/mk/bsd.port.mk:2602 'build': @lock=piglit-20210128; export _LOCKS_HELD=" piglit-2...) ===> Exiting graphics/piglit with an error *** Error 1 in /usr/ports (infrastructure/mk/bsd.port.subdir.mk:137 'build': @: ${echo_msg:=echo}; : ${target:=build}; for i in ; do eval... Index: Makefile =================================================================== RCS file: /cvs/ports/graphics/piglit/Makefile,v retrieving revision 1.15 diff -u -p -r1.15 Makefile --- Makefile 23 Feb 2021 19:39:26 -0000 1.15 +++ Makefile 30 Mar 2021 05:18:57 -0000 @@ -8,6 +8,7 @@ DISTNAME = piglit-20210128 GH_ACCOUNT = mesa3d GH_PROJECT = piglit GH_COMMIT = 83173d9536c9f5e1571efe5933d210466ec255b8 +REVISION = 0 CATEGORIES = graphics @@ -37,6 +38,7 @@ RUN_DEPENDS = devel/py-six${MODPY_FLAVO math/py-numpy${MODPY_FLAVOR} \ www/py-mako${MODPY_FLAVOR} BUILD_DEPENDS = ${RUN_DEPENDS} \ + graphics/glslang \ graphics/vulkan-headers LIB_DEPENDS = graphics/waffle \