Conditionally link libspl on FreeBSD

FreeBSD's version of `libnvpair` uses functions (for example `libspl_assertf`) from `libspl`. Right now build is broken on FreeBSD due to this.

1 files changed, 4 insertions, 0 deletions

diff --git a/nvpair-sys/build.rs b/nvpair-sys/build.rs
index ecb0ccc..155c74e 100644
--- a/nvpair-sys/build.rs
+++ b/nvpair-sys/build.rs
@@ -3,4 +3,8 @@ fn main() {
     // FIXME: a bug exists in some versions of libnvpair causing it to depend on a symbol called
     // `aok`, which is in `libzfs`.
     println!("cargo:rustc-link-lib=zfs");
+    // nvpair uses functions from libspl on FreeBSD
+    if cfg!(target_os="freebsd") {
+      println!("cargo:rustc-link-lib=spl");
+    };
 }