math/blas build failure - cmake lossage

[Greg Troxel <gdt%lexort.com@localhost>]

math/blas fails on netbsd-10 amd64 with pkgsrc up to date:

  -- Build html documentation: OFF
  -- Build man documentation: OFF
  -- Configuring done (0.6s)
  CMake Error: CMake can not determine linker language for target: run_test_zcomplexabs
  CMake Error: CMake can not determine linker language for target: run_test_zcomplexdiv
  CMake Error: CMake can not determine linker language for target: run_test_zcomplexmult
  CMake Error: CMake can not determine linker language for target: run_test_zminMax
  -- Generating done (0.1s)
  CMake Generate step failed.  Build files cannot be regenerated correctly.
  *** Error code 1

Digging into CMakeLists.txt, I find:

where run_test_zcomplexabs has both a command and sources.


  add_executable( test_zcomplexabs ${LAPACK_SOURCE_DIR}/INSTALL/test_zcomplexabs.f )
  add_custom_target( run_test_zcomplexabs
    COMMAND test_zcomplexabs 2> test_zcomplexabs.err
    WORKING_DIRECTORY ${LAPACK_BINARY_DIR}/INSTALL
    COMMENT "Running test_zcomplexabs in ${LAPACK_BINARY_DIR}/INSTALL with stderr: test_zcomplexabs.err"
    SOURCES ${LAPACK_SOURCE_DIR}/INSTALL/test_zcomplexabs.f )


dropping SOURCES makes it build.


Does anybody understand cmake enough to know what is right?