configure: error: Could not find exec_prefix for openssl

[linuxunderground]

Since version 3.3.x, openssl pkgconfig files have been cleaned and the exec_prefix line was removed (openssl commit : openssl/openssl@2ac569a).

And unfortunately, eid-mw configure relies on exec_prefix :
$ grep -n openssl configure.ac
206:PKG_CHECK_MODULES(SSL, "openssl", [HAVE_OPENSSL=1])
207:PKG_CHECK_VAR(SSL_PREFIX, "openssl", "exec_prefix",, AC_MSG_ERROR([Could not find exec_prefix for openssl]))

And so eid-mw failed to compile with openssl 3.3.x

[linuxunderground]

The issue is solved for me because Gentoo patched OpenSSL 3.3.1 (FYI, see https://bugs.gentoo.org/936576)

However, the issue could possibly occur for other linux distributions.

[yoe]

Yeah, we will indeed see that with other distributions too, so this will need a fix. Reopening.

[yoe]

@tocharl we look for exec_prefix and set it to SSL_PREFIX, so that the openssl commands in the install-data-hook target of plugins_tools/eid-viewer/Makefile.am can use the path to openssl. We may need to find a different way to do that.