diff -up src/module_list.py.orig src/module_list.py
--- src/module_list.py.orig	2019-10-03 16:51:55.350850836 -0300
+++ src/module_list.py	2019-10-03 16:52:06.479917297 -0300
@@ -11,20 +11,17 @@ SAGE_INC = '/usr/include'
 import pkgconfig
 
 # CBLAS can be one of multiple implementations
-cblas_pc = pkgconfig.parse('cblas')
-cblas_libs = cblas_pc['libraries']
-cblas_library_dirs = cblas_pc['library_dirs']
-cblas_include_dirs = cblas_pc['include_dirs']
+cblas_libs = ['flexiblas']
+cblas_library_dirs = ['/usr/lib']
+cblas_include_dirs = ['/usr/include/flexiblas']
 
 # TODO: Remove Cygwin hack by installing a suitable cblas.pc
 if os.path.exists('/usr/lib/libblas.dll.a'):
     cblas_libs = ['gslcblas']
 
-# LAPACK can be one of multiple implementations
-lapack_pc = pkgconfig.parse('lapack')
-lapack_libs = lapack_pc['libraries']
-lapack_library_dirs = lapack_pc['library_dirs']
-lapack_include_dirs = lapack_pc['include_dirs']
+lapack_libs = [ 'flexiblas' ]
+lapack_library_dirs = ['/usr/lib']
+lapack_include_dirs = ['/usr/include/flexiblas']
 
 # GD image library
 gd_pc = pkgconfig.parse('gdlib')
diff -up src/sage/misc/cython.py.orig src/sage/misc/cython.py
--- src/sage/misc/cython.py.orig	2019-10-03 16:51:42.848776173 -0300
+++ src/sage/misc/cython.py	2019-10-03 16:52:06.480917303 -0300
@@ -35,10 +35,9 @@ from sage.misc.sage_ostools import resto
 
 
 # CBLAS can be one of multiple implementations
-cblas_pc = pkgconfig.parse('cblas')
-cblas_libs = list(cblas_pc['libraries'])
-cblas_library_dirs = list(cblas_pc['library_dirs'])
-cblas_include_dirs = list(cblas_pc['include_dirs'])
+cblas_libs = ['flexiblas']
+cblas_library_dirs = ['/usr/lib']
+cblas_include_dirs = ['/usr/include/flexiblas']
 
 standard_libs = [
     'mpfr', 'gmp', 'gmpxx', 'stdc++', 'pari', 'm',