meson-0.56.0 needs to be patched re static libraries in pkgconfig.
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Discussion last month and then earleir this month, thread for this month starts at http://lists.linuxfromscratch.org/pipermail/blfs-support/2020-December/082381.html
Short story - libsoup wants a static lib from sysprof, but meson-0.56.0 screwed up the pkgconfig handling. Fixed upstream for meson-0.56.11 but that has not yet been released.
I uploaded a patch a few days ago, but at that time I had not rebuilt sysprof with the revised meson (I'd used the option to disable sysprof in my own build).
I've now used jhalfs to build sysprof and libsoup in BLFS, using patched meson. so I can confirm that the fix works and should be in LFS.