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Since emscripten 6.0.5 `-shared` produces a real side module by default, so healpy's vendored cfitsio and libsharp are now real shared libraries and `-lcfitsio` resolves to the .so rather than the .a. autoconf's AC_CHECK_LIB declares the probed function itself as `char ffgnrwll (void);`, which does not match the real prototype, and across a shared library boundary wasm-ld promotes the signature mismatch from a warning to an error, so healpix_cxx's configure fails with "could not find the cfitsio library". Prime autoconf's cache to skip the two affected probes.
This reverts commit 0c82d68.
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