build: fix pkgs for FBSD port runs

pkg/cimgui/build.zig

@@ -72,6 +72,10 @@ pub fn build(b: *std.Build) !void {
         });
     }
 
+    if (target.result.os.tag == .freebsd) {
+        try flags.append(b.allocator, "-fPIC");
+    }
+
     if (imgui_) |imgui| {
         lib.addCSourceFile(.{ .file = b.path("vendor/cimgui.cpp"), .flags = flags.items });
         lib.addCSourceFile(.{ .file = imgui.path("imgui.cpp"), .flags = flags.items });

pkg/freetype/build.zig

@@ -90,6 +90,10 @@ fn buildLib(b: *std.Build, module: *std.Build.Module, options: anytype) !*std.Bu
         "-fno-sanitize=undefined",
     });
 
+    if (target.result.os.tag == .freebsd) {
+        try flags.append(b.allocator, "-fPIC");
+    }
+
     const dynamic_link_opts = options.dynamic_link_opts;
 
     // Zlib

pkg/glslang/build.zig

@@ -66,6 +66,10 @@ fn buildGlslang(
         "-fno-sanitize-trap=undefined",
     });
 
+    if (target.result.os.tag == .freebsd) {
+        try flags.append(b.allocator, "-fPIC");
+    }
+
     if (upstream_) |upstream| {
         lib.addCSourceFiles(.{
             .root = upstream.path(""),

pkg/spirv-cross/build.zig

@@ -74,6 +74,10 @@ fn buildSpirvCross(
         "-fno-sanitize-trap=undefined",
     });
 
+    if (target.result.os.tag == .freebsd) {
+        try flags.append(b.allocator, "-fPIC");
+    }
+
     if (b.lazyDependency("spirv_cross", .{})) |upstream| {
         lib.addIncludePath(upstream.path(""));
         module.addIncludePath(upstream.path(""));