diff --git a/build.zig b/build.zig
index f24273a7..3d737073 100644
--- a/build.zig
+++ b/build.zig
@@ -91,7 +91,7 @@ const BuzzBuildOptions = struct {
     }
 };
 
-fn getBuzzPrefix(b: *Build) []const u8 {
+fn getBuzzPrefix(b: *Build) ![]const u8 {
     return std.posix.getenv("BUZZ_PATH") orelse std.fs.path.dirname(b.exe_dir).?;
 }
 
@@ -492,7 +492,7 @@ pub fn build(b: *Build) !void {
                 .{
                     .path = b.fmt(
                         "{s}" ++ std.fs.path.sep_str ++ "lib/buzz",
-                        .{getBuzzPrefix(b)},
+                        .{try getBuzzPrefix(b)},
                     ),
                 },
             );
@@ -535,7 +535,7 @@ pub fn build(b: *Build) !void {
     const test_step = b.step("test", "Run all the tests");
     const run_tests = b.addRunArtifact(tests);
     run_tests.cwd = Build.LazyPath{ .path = "." };
-    run_tests.setEnvironmentVariable("BUZZ_PATH", getBuzzPrefix(b));
+    run_tests.setEnvironmentVariable("BUZZ_PATH", try getBuzzPrefix(b));
     run_tests.step.dependOn(install_step); // wait for libraries to be installed
     test_step.dependOn(&run_tests.step);
 
diff --git a/src/Parser.zig b/src/Parser.zig
index 1cc4c766..dbd743fd 100644
--- a/src/Parser.zig
+++ b/src/Parser.zig
@@ -132,11 +132,16 @@ pub fn defaultBuzzPrefix() []const u8 {
 
 var _buzz_path_buffer: [4096]u8 = undefined;
 pub fn buzzPrefix() []const u8 {
-    if (std.posix.getenv("BUZZ_PATH")) |buzz_path| return buzz_path;
+    // FIXME: don't use std.posix directly
+    if (std.posix.getenv("BUZZ_PATH")) |buzz_path| {
+        return buzz_path;
+    }
+
     const path = if (!is_wasm)
         std.fs.selfExePath(&_buzz_path_buffer) catch return defaultBuzzPrefix()
     else
         defaultBuzzPrefix();
+
     const path1 = std.fs.path.dirname(path) orelse defaultBuzzPrefix();
     const path2 = std.fs.path.dirname(path1) orelse defaultBuzzPrefix();
     return path2;
@@ -144,10 +149,16 @@ pub fn buzzPrefix() []const u8 {
 
 var _buzz_path_buffer2: [4096]u8 = undefined;
 /// the returned string can be used only until next call to this function
-pub fn buzzLibPath() []const u8 {
+pub fn buzzLibPath() ![]const u8 {
     const path2 = buzzPrefix();
     const sep = std.fs.path.sep_str;
-    return std.fmt.bufPrint(&_buzz_path_buffer2, "{s}" ++ sep ++ "lib" ++ sep ++ "buzz", .{path2}) catch unreachable;
+    return std.fmt.bufPrint(
+        &_buzz_path_buffer2,
+        "{s}" ++ sep ++ "lib" ++ sep ++ "buzz",
+        .{
+            path2,
+        },
+    ) catch unreachable;
 }
 
 pub const CompileError = error{
@@ -6936,11 +6947,31 @@ fn searchPaths(self: *Self, file_name: []const u8) ![][]const u8 {
     defer paths.shrinkAndFree(paths.items.len);
 
     for (search_paths) |path| {
-        const filled = try std.mem.replaceOwned(u8, self.gc.allocator, path, "?", file_name);
+        const filled = try std.mem.replaceOwned(
+            u8,
+            self.gc.allocator,
+            path,
+            "?",
+            file_name,
+        );
         defer self.gc.allocator.free(filled);
-        const suffixed = try std.mem.replaceOwned(u8, self.gc.allocator, filled, "!", "buzz");
+        const suffixed = try std.mem.replaceOwned(
+            u8,
+            self.gc.allocator,
+            filled,
+            "!",
+            "buzz",
+        );
         defer self.gc.allocator.free(suffixed);
-        const prefixed = try std.mem.replaceOwned(u8, self.gc.allocator, suffixed, "$", buzzLibPath());
+        const prefixed = try std.mem.replaceOwned(
+            u8,
+            self.gc.allocator,
+            suffixed,
+            "$",
+            try buzzLibPath(),
+        );
+
+        std.debug.print("> {s}\n", .{prefixed});
 
         try paths.append(prefixed);
     }
@@ -6952,7 +6983,13 @@ fn searchLibPaths(self: *Self, file_name: []const u8) !std.ArrayList([]const u8)
     var paths = std.ArrayList([]const u8).init(self.gc.allocator);
 
     for (lib_search_paths) |path| {
-        const filled = try std.mem.replaceOwned(u8, self.gc.allocator, path, "?", file_name);
+        const filled = try std.mem.replaceOwned(
+            u8,
+            self.gc.allocator,
+            path,
+            "?",
+            file_name,
+        );
         defer self.gc.allocator.free(filled);
         const suffixed = try std.mem.replaceOwned(
             u8,
@@ -6967,7 +7004,13 @@ fn searchLibPaths(self: *Self, file_name: []const u8) !std.ArrayList([]const u8)
             },
         );
         defer self.gc.allocator.free(suffixed);
-        const prefixed = try std.mem.replaceOwned(u8, self.gc.allocator, suffixed, "$", buzzLibPath());
+        const prefixed = try std.mem.replaceOwned(
+            u8,
+            self.gc.allocator,
+            suffixed,
+            "$",
+            try buzzLibPath(),
+        );
 
         try paths.append(prefixed);
     }
diff --git a/src/Reporter.zig b/src/Reporter.zig
index 78c63a02..a4a42aaf 100644
--- a/src/Reporter.zig
+++ b/src/Reporter.zig
@@ -185,8 +185,10 @@ pub const Report = struct {
 
     pub fn report(self: *Report, reporter: *Self, out: anytype) !void {
         assert(self.items.len > 0);
+        var env_map = try std.process.getEnvMap(reporter.allocator);
+        defer env_map.deinit();
 
-        const colorterm = std.posix.getenv("COLORTERM");
+        const colorterm = env_map.get("COLORTERM");
         const true_color = if (colorterm) |ct|
             std.mem.eql(u8, ct, "24bit") or std.mem.eql(u8, ct, "truecolor")
         else
diff --git a/src/jit_extern_api.zig b/src/jit_extern_api.zig
index ca337c91..9207e5f4 100644
--- a/src/jit_extern_api.zig
+++ b/src/jit_extern_api.zig
@@ -6,7 +6,7 @@ const JIT = @import("Jit.zig");
 const jmp = @import("jmp.zig").jmp;
 
 export fn bz_exit(code: c_int) noreturn {
-    std.posix.exit(@truncate(@as(c_uint, @bitCast(code))));
+    std.process.exit(@truncate(@as(c_uint, @bitCast(code))));
 }
 
 pub const ExternApi = enum {
diff --git a/src/lib/buzz_ffi.zig b/src/lib/buzz_ffi.zig
index 79fc0954..e5f5b14a 100644
--- a/src/lib/buzz_ffi.zig
+++ b/src/lib/buzz_ffi.zig
@@ -14,7 +14,12 @@ pub export fn alignOf(ctx: *api.NativeCtx) c_int {
         var msg = std.ArrayList(u8).init(api.VM.allocator);
         defer msg.deinit();
 
-        msg.writer().print("Could not parse zig type `{s}`", .{zig_type_str[0..len]}) catch @panic("Out of memory");
+        msg.writer().print(
+            "Could not parse zig type `{s}`",
+            .{
+                zig_type_str[0..len],
+            },
+        ) catch @panic("Out of memory");
 
         ctx.vm.pushError("ffi.FFIZigTypeParseError", msg.items);
 
@@ -37,7 +42,12 @@ pub export fn sizeOf(ctx: *api.NativeCtx) c_int {
         var msg = std.ArrayList(u8).init(api.VM.allocator);
         defer msg.deinit();
 
-        msg.writer().print("Could not parse zig type `{s}`", .{zig_type_str[0..len]}) catch @panic("Out of memory");
+        msg.writer().print(
+            "Could not parse zig type `{s}`",
+            .{
+                zig_type_str[0..len],
+            },
+        ) catch @panic("Out of memory");
 
         ctx.vm.pushError("ffi.FFIZigTypeParseError", msg.items);
 
diff --git a/src/lib/buzz_os.zig b/src/lib/buzz_os.zig
index 708166ed..74eaed8e 100644
--- a/src/lib/buzz_os.zig
+++ b/src/lib/buzz_os.zig
@@ -27,7 +27,8 @@ pub export fn env(ctx: *api.NativeCtx) c_int {
     const key_slice = api.VM.allocator.dupeZ(u8, key.?[0..len]) catch @panic("Out of memory");
     defer api.VM.allocator.free(key_slice);
 
-    if (std.posix.getenvZ(key_slice)) |value| {
+    // FIXME: don't use std.posix directly
+    if (std.posix.getenv(key_slice)) |value| {
         ctx.vm.bz_pushString(api.ObjString.bz_string(ctx.vm, if (value.len > 0) @as([*]const u8, @ptrCast(value)) else null, value.len) orelse {
             @panic("Out of memory");
         });
@@ -96,7 +97,7 @@ pub export fn tmpFilename(ctx: *api.NativeCtx) c_int {
 pub export fn buzzExit(ctx: *api.NativeCtx) c_int {
     const exitCode: i32 = ctx.vm.bz_peek(0).integer();
 
-    std.posix.exit(@intCast(exitCode));
+    std.process.exit(@intCast(exitCode));
 
     return 0;
 }
diff --git a/src/lib/buzz_std.zig b/src/lib/buzz_std.zig
index a6f9a39b..d1a20bda 100644
--- a/src/lib/buzz_std.zig
+++ b/src/lib/buzz_std.zig
@@ -56,7 +56,7 @@ pub export fn toInt(ctx: *api.NativeCtx) c_int {
     ctx.vm.bz_push(
         api.Value.fromInteger(
             if (value.isFloat())
-                @as(i32, @intFromFloat(value.float()))
+                @intFromFloat(value.float())
             else
                 value.integer(),
         ),
@@ -71,7 +71,7 @@ pub export fn toFloat(ctx: *api.NativeCtx) c_int {
     ctx.vm.bz_push(
         api.Value.fromFloat(
             if (value.isInteger())
-                @as(f64, @floatFromInt(value.integer()))
+                @floatFromInt(value.integer())
             else
                 value.float(),
         ),
@@ -219,7 +219,7 @@ pub export fn assert(ctx: *api.NativeCtx) c_int {
         }
 
         if (!is_wasm) {
-            std.posix.exit(1);
+            std.process.exit(1);
         }
     }
 
diff --git a/src/main.zig b/src/main.zig
index 267c2cca..b6525182 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -245,7 +245,7 @@ pub fn main() !void {
         printBanner(std.io.getStdOut().writer(), true);
 
         if (!is_wasm) {
-            std.posix.exit(0);
+            std.process.exit(0);
         }
     }
 
@@ -272,7 +272,7 @@ pub fn main() !void {
         );
 
         if (!is_wasm) {
-            std.posix.exit(0);
+            std.process.exit(0);
         }
     }
 
@@ -314,7 +314,7 @@ pub fn main() !void {
     if (!is_wasm and flavor == .Repl) {
         repl(allocator) catch {
             if (!is_wasm) {
-                std.posix.exit(1);
+                std.process.exit(1);
             }
 
             std.debug.print("REPL stopped", .{});
@@ -327,7 +327,7 @@ pub fn main() !void {
             flavor,
         ) catch {
             if (!is_wasm) {
-                std.posix.exit(1);
+                std.process.exit(1);
             }
 
             std.debug.print("VM stopped", .{});
@@ -339,7 +339,7 @@ pub fn main() !void {
     }
 
     if (!is_wasm) {
-        std.posix.exit(0);
+        std.process.exit(0);
     }
 }
 
@@ -406,7 +406,13 @@ test "Testing behavior" {
                 const reader = test_file.reader();
                 const first_line = try reader.readUntilDelimiterAlloc(allocator, '\n', std.math.maxInt(usize));
                 defer allocator.free(first_line);
-                const arg0 = std.fmt.allocPrintZ(allocator, "{s}/bin/buzz", .{Parser.buzzPrefix()}) catch unreachable;
+                const arg0 = std.fmt.allocPrintZ(
+                    allocator,
+                    "{s}/bin/buzz",
+                    .{
+                        Parser.buzzPrefix(),
+                    },
+                ) catch unreachable;
                 defer allocator.free(arg0);
 
                 const result = try std.ChildProcess.run(
@@ -449,5 +455,5 @@ test "Testing behavior" {
         fail_count,
     });
 
-    std.posix.exit(if (fail_count == 0) 0 else 1);
+    std.process.exit(if (fail_count == 0) 0 else 1);
 }
diff --git a/src/vm.zig b/src/vm.zig
index bcdfd893..d27bc6a8 100644
--- a/src/vm.zig
+++ b/src/vm.zig
@@ -783,7 +783,7 @@ pub const VM = struct {
     fn vmPanic(e: anytype) void {
         std.debug.print("{}\n", .{e});
         if (!is_wasm) {
-            std.posix.exit(1);
+            std.process.exit(1);
         }
     }
 
@@ -4013,7 +4013,7 @@ pub const VM = struct {
                 );
 
                 if (!is_wasm) {
-                    std.posix.exit(1);
+                    std.process.exit(1);
                 } else {
                     return Error.RuntimeError;
                 }