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commit ad86a41eeed9f85d74bb50a25fa0bf4515aaf3af
Author: Fabrice Fontaine 
Date:   Thu Apr 11 23:24:36 2019 +0200

    configure.ng: use pkg-config to find PpenSSL dependencies

    OpenSSL can depends on lz or latomic so use pkg-config to find those
    dependencies and fallback to existing mechanism.

    Signed-off-by: Fabrice Fontaine 

    Closes #256.

diff --git a/configure.ng b/configure.ng

--- a/configure.ng
+++ b/configure.ng
@@ -464,8 +464,11 @@ AC_ARG_WITH(openssl,
 				CPPFLAGS="-I$withval/include $CPPFLAGS"
 				LDFLAGS="-L$withval/lib $LDFLAGS"
 			fi
-			AC_CHECK_LIB(crypto, BIO_s_mem)
-			AC_CHECK_LIB(ssl, SSL_new)
+			PKG_CHECK_MODULES([OPENSSL], [libssl libcrypto],
+				[LIBS="$LIBS $OPENSSL_LIBS" CFLAGS="$CFLAGS $OPENSSL_CFLAGS"],
+				[AC_CHECK_LIB(crypto, BIO_s_mem)
+				AC_CHECK_LIB(ssl, SSL_new)]
+			)
 			AC_CHECK_FUNCS(SSL_new, x_ssl_openssl=yes,
 				AC_MSG_ERROR([Can't enable openssl])
 			)

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