configure: add workaround for systems without zlib.pc

Some systems (e.g. FreeBSD) might not have installed the appropriate
pkg-config file as they should. We can workaround the issue by creating
the .pc file they should have distributed.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/compat/gen_zlib_pc.c b/compat/gen_zlib_pc.c
new file mode 100644
index 00000000..198a727c
--- /dev/null
+++ b/compat/gen_zlib_pc.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <zlib.h>
+
+static const char *template =
+	"prefix=/usr\n"
+	"exec_prefix=${prefix}\n"
+	"libdir=${exec_prefix}/lib\n"
+	"\n"
+	"Name: zlib\n"
+	"Description: zlib compression library\n"
+	"Version: %s\n"
+	"Libs: -lz\n";
+
+int main(void)
+{
+	printf(template, ZLIB_VERSION);
+	return 0;
+}