Fix build when libraries can not be found #19

Job	Run time
codecheck / codecheck	2m 1s
docker / docker (fedora39)	8m 33s
conda / conda (ubuntu-20.04)	11m 6s
docker / docker (rocky8)	10m 9s
conda / conda (macos-12)	22m 13s
linux / linux (-doc-mpi-)	12m 14s
conda / conda (macos-14)	7m 17s
linux / linux (-mpi-)	10m 35s
mac / macports (macos-12)	12m 58s
mac / macsimple (macos-12)	10m 46s
linux / linux (-coverage-mpi-)	9m 58s
mac / macports (macos-14)	6m 59s
mac / macsimple (macos-14)	4m 28s
linux / linux (-debug-)	12m 29s
mac / macports (+allmodules, macos-12)	10m 27s
linux / linux (-debug-mpi-)	15m 10s
linux / linux (-intel-)	13m 38s
linux / linux (-pycv-mpi-)	10m 24s
	3h 11m 25s

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