Ting-Wei Lan authored Jan 07, 2018 and Christophe Fergeau committed Jan 08, 2018

FreeBSD has OpenSSL installed in base, but .pc files are not available.
We can still successfully build spice-gtk by setting SSL_CFLAGS and
SSL_LIBS variables manually, but openssl will still be recorded to
Requires.private field of spice-client-glib-2.0.pc, causing problems for
applications using spice-gtk. To workaround the issue, we do the check
again without using SSL_CFLAGS and SSL_LIBS variables and put SSL_LIBS
into Libs.private field when openssl.pc cannot be found.

https://bugs.freedesktop.org/show_bug.cgi?id=104524