Created attachment 639494 [details, diff]
tilp2's configure.ac contains a Bashism (use of == operator with test built-in). Thus, configure emits an error when /bin/sh is not Bash. This doesn't cause the build to fail outright, but it may be causing misdetection of features.
if test "x$build" == "x$host" ; then
checking for the host compiler... ./configure: 20469: test: xx86_64-pc-linux-gnu: unexpected operator
The attached patch removes the Bashism and allows sci-calculators/tilp2-1.18 to configure without error when /bin/sh is Dash.