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libgsl awkwardness


From: Henrik Moller
Subject: libgsl awkwardness
Date: Mon, 30 Dec 2024 11:50:27 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0

Building 1808, I got a few errors like:
/usr/bin/ld: apl-QR_factorization_GSL.o: in function `GSL::QR_factorize_ZZ_matrix(Value&, int, int, Cell const*)':
QR_factorization_GSL.cc:(.text+0x97b): undefined reference to `gsl_linalg_complex_QR_decomp_r'
Turned out that ./configure was picking up an older version of libgsl (probably in /usr/lib64 from my original installation rather than my update in /usr/local/lib).  Almost certainly my own fault for being careless with updates, but, if anyone else has the same problem, it's easily fixed with:
./configure --with-gsl=/usr/local/lib
or wherever you keep your updates.

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