Merge remote-tracking branch 'origin/develop' into add_sp_mod

README.md

@@ -31,8 +31,9 @@ Code Manager: [Alex Richert](mailto:[email protected])
 
 ### Prerequisites
 
-This package does not link to any other libraries, but requires CMake (version
-3.15+) to build.
+This package requires a BLAS/LAPACK library to provide several LU decomposition-related
+routines, and requires CMake (version 3.15+) to build. In spack-stack, OpenBLAS will
+be used as the provider of BLAS/LAPACK routines for all compilers.
 
 ### Installing
 

docs/user_guide.md

@@ -19,6 +19,11 @@ where for certain regions of certain grids, floating point differences between
 field values. Some applications may therefore benefit from the use of 8-byte
 reals (libip_d or libip_8).
 
+NCEPLIBS-ip uses several BLAS/LAPACK routines in the splat() subroutine, and
+therefore requires an external BLAS/LAPACK provider. In practice, this should
+generally be OpenBLAS, which is the [spack-stack](https://github.com/JCSDA/spack-stack)
+BLAS/LAPACK provider.
+
 ## Interpolation
 
 ### Interpolation Methods