so there are more issues, at least for sage/matrix/matrix_integer_sparse.so:
this extension uses fflas-ffpack, which has a pkg-config file: /------------------ fflas-ffpack.pc ------------------------ prefix=/usr exec_prefix=/usr libdir=/usr/lib includedir=/usr/include Name: fflas-ffpack Description: Finite Field Linear Algebra Suroutines/Package URL: http://github.com/linbox-team/fflas-ffpack Version: 2.3.2 Requires: givaro >= 4.0.3 Libs: -fopenmp -lblas -llapack Cflags: -I${prefix}/include -fopenmp -fabi-version=6 \------------------------------------------------------- while the sagemath build system gets the Cflags correctly, it misses the Libs, and then misses to link libgomp. You may want to argue that fflas-ffpack should define -fopenmp in Ldflags, but sagemath doesn't seem to pick that up either.
