Allow build to link to an already installed liblsl version

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "lsl"
-version = "0.1.1"
+version = "0.1.2"
 authors = ["Intheon <contact@intheon.io>", "Christian Kothe <christian.kothe@intheon.io>"]
 edition = "2018"
 description = "Lab streaming layer (liblsl) bindings for rust."
@@ -13,7 +13,7 @@ categories = ["api-bindings", "network-programming"]
 members = ["lsl-sys"]
 
 [dependencies]
-lsl-sys = { version = "0.1.1", path = "lsl-sys" }
+lsl-sys = { version = "0.1.2", path = "lsl-sys" }
 
 [dev-dependencies]
 rand = "~0.7"

lsl-sys/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "lsl-sys"
-version = "0.1.1"
+version = "0.1.2"
 authors = ["Intheon <contact@intheon.io>", "Christian Kothe <christian.kothe@intheon.io>"]
 edition = "2018"
 description = "Low-level bindings to the system liblsl library (lab streaming layer)."

lsl-sys/build.rs

@@ -1,8 +1,8 @@
 use std::env;
+use std::path::Path;
 
 fn main() {
-    // TODO: find out if liblsl already present on system and usable (if so, link to that instead)
-    // println!("cargo:warning={}", "rebuilding...");
+    println!("cargo:warning={}", "Building LSL from soruce...");
     build_liblsl();
 }
 
@@ -15,6 +15,14 @@ fn build_liblsl() {
     cfg
         .define("LSL_NO_FANCY_LIBNAME", "ON")
         .define("LSL_BUILD_STATIC", "ON");
+
+    // Disable framework build on macOS
+    // It doesn't work otherwise
+    #[cfg(target_os = "macos")]
+    {
+        cfg.define("LSL_FRAMEWORK", "OFF");
+    } 
+
     if target.contains("msvc") {
         // override some C/CXX flags that the cmake crate splices in on Windows
         // (these cause the build to fail)...