Created attachment 655810
hugin-2019.2-lapack-blas.patch

cd /tmp/portage/media-gfx/hugin-2019.2.0/work/hugin-2019.2.0_build/src/tools && /usr/bin/cmake -E cmake_link_script CMakeFiles/cpclean.dir/link.txt --verbose=1
/usr/sbin/x86_64-pc-linux-gnu-g++ -pipe -O2 -march=znver1 -Wl,-O1 -Wl,--as-needed -Wl,--hash-style=gnu -fopenmp CMakeFiles/cpclean.dir/cpclean.cpp.o -o cpclean  -Wl,-rpath,/tmp/portage/media-gfx/hugin-2019.2.0/work/hugin-2019.2.0_build/src/hugin_base: ../hugin_base/libhuginbase.so.0.0 /usr/lib64/libpano13.so ../foreign/levmar/libhuginlevmar.a /usr/lib64/libGLEW.so /usr/lib64/libboost_filesystem-mt.so /usr/lib64/libboost_system-mt.so /usr/lib64/liblapack.so /usr/lib64/libfftw3.so /usr/lib64/libvigraimpex.so /usr/lib64/libImath.so /usr/lib64/libIlmImf.so /usr/lib64/libIex.so /usr/lib64/libHalf.so /usr/lib64/libIlmThread.so /usr/lib64/libz.so /usr/lib64/libjpeg.so /usr/lib64/libtiff.so /usr/lib64/libpng.so /usr/lib64/libz.so /usr/lib64/libz.so /usr/lib64/libexiv2.so /usr/lib64/liblcms2.so -pthread /usr/lib64/libX11.so /usr/lib64/libpano13.so /usr/lib64/libboost_filesystem-mt.so /usr/lib64/libboost_system-mt.so /usr/lib64/liblapack.so /usr/lib64/libGL.so /usr/lib64/libGLU.so /usr/lib64/libGLEW.so /usr/lib64/libsqlite3.so /usr/lib64/libvigraimpex.so /usr/lib64/libjpeg.so /usr/lib64/libpng.so /usr/lib64/libtiff.so /usr/lib64/libexiv2.so /usr/lib64/liblcms2.so 
../hugin_base/libhuginbase.so.0.0: error: undefined reference to 'dgemm_'
collect2: error: ld returned 1 exit status


```
hugin-2019.2.0/src/foreign/levmar/misc_core.c:45:#define GEMM LM_MK_BLAS_NAME(gemm)
```

This function is a BLAS function: https://en.wikipedia.org/wiki/Basic_Linear_Algebra_Subprograms#Level_3

Thus, since levmar is built as a static library, Hugin itself should call `find_package(BLAS)` and `huginbase` should link against `BLAS_LIBRARIES`.

Attached patch fixes this (in an admittedly slightly crude way) for me.

Upstream report: https://bugs.launchpad.net/hugin/+bug/1892420


Portage 3.0.4 (python 3.6.9-final-0, default/linux/amd64/17.1/desktop/plasma/systemd, gcc-10.2.0, glibc-2.32, 5.8.1 x86_64)
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Timestamp of repository gentoo: Thu, 20 Aug 2020 18:45:01 +0000
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Head commit of repository flatpak-overlay: 26c396aef4d2f8908eea9b3ad2ccf7dc843a0887

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=================================================================
                        Package Settings
=================================================================

media-gfx/hugin-2019.2.0::gentoo was built with the following:
USE="lapack python raw sift -debug" ABI_X86="(64)" L10N="de en-GB ja zh-CN zh-TW -ca -ca-valencia -cs -da -es -eu -fi -fr -hu -it -nl -pl -pt-BR -ro -ru -sk -sv" PYTHON_SINGLE_TARGET="python3_7 -python3_6 -python3_8"


sci-libs/lapack-3.8.0-r1::gentoo was built with the following:
USE="-deprecated -doc -eselect-ldso -lapacke" ABI_X86="(64)"