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--- a/m4/ax_lib_fftw3.m4 2026-09-15 09:01:23.181964635 +0200
+++ b/m4/ax_lib_fftw3.m4 2026-09-15 09:04:28.721957025 +0200
@@ -80,7 +80,8 @@
fftw3_lib_flag=""
fftw3_LIBS=""
else
- fftw3_libname="${!fftw3_libvar:2}"
+ eval "fftw3_lib_flag=\$${fftw3_libvar}"
+ fftw3_libname="${fftw3_lib_flag#??}"
fftw3_lib_flag="-l${fftw3_libname}"
fftw3_LIBS="${fftw3_lib_flag} -lm"
fi
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