* installing *source* package ‘sparselu’ ...
** this is package ‘sparselu’ version ‘0.3.0’
** package ‘sparselu’ successfully unpacked and MD5 sums checked
** using staged installation
configure: using pkg-config binary 'pkg-config'
configure: checking pkg-config module 'umfpack'
configure: checking pkg-config module 'UMFPACK'
configure: pkg-config modules not found: umfpack, UMFPACK
configure: compiler multiarch triplet: arm64-apple-darwin22.6.0
configure: manual SuiteSparse prefix search list: /usr /usr/local /opt/homebrew /opt/local
configure: checking prefix '/usr'
configure: UMFPACK header not found under '/usr/include'
configure: checking prefix '/usr/local'
configure: UMFPACK header not found under '/usr/local/include'
configure: checking prefix '/opt/homebrew'
configure: UMFPACK header not found under '/opt/homebrew/include'
configure: checking prefix '/opt/local'
configure: UMFPACK header not found under '/opt/local/include'
configure: manual fallback did not find UMFPACK headers
configure: final PKG_CPPFLAGS: <empty>
configure: final PKG_LIBS: <empty>
configure: error: Unable to determine SuiteSparse/UMFPACK linker flags.
Set the environment variables PKG_LIBS or SUITESPARSE_HOME before installing,
or make sure pkg-config can find the 'umfpack' or 'UMFPACK' module.
ERROR: configuration failed for package ‘sparselu’
* removing ‘/Volumes/Builds/packages/big-sur-arm64/results/4.5/sparselu.Rcheck/sparselu’