1 files changed, 8 insertions, 0 deletions
diff --git a/libssh2-sys/build.rs b/libssh2-sys/build.rs
index 1a406a3..5ddc70c 100644
--- a/libssh2-sys/build.rs
+++ b/libssh2-sys/build.rs
@@ -122,6 +122,10 @@ fn main() {
     cfg.define("LIBSSH2_HAVE_ZLIB", None);
     if let Some(path) = env::var_os("DEP_Z_INCLUDE") {
         cfg.include(path);
+    } else if let Ok(lib) = pkg_config::find_library("zlib") {
+        for path in &lib.include_paths {
+            cfg.include(path);
+        }
     }
 
     if let Some(path) = env::var_os("DEP_OPENSSL_INCLUDE") {
@@ -132,6 +136,10 @@ fn main() {
                 }
             }
         }
+    } else if let Ok(lib) = pkg_config::find_library("openssl") {
+        for path in &lib.include_paths {
+            cfg.include(path);
+        }
     }
 
     let libssh2h = fs::read_to_string("libssh2/include/libssh2.h").unwrap();