diff --git a/build.c b/build.c
new file mode 100644
index 0000000..74242d2
--- /dev/null
+++ b/build.c
@@ -0,0 +1,69 @@
+#include "build.h"
+
+int main() {
+    /* Some variables we need */
+    char *CXXFLAGS = strcpy(calloc(1024, 1), maybe(getenv("CXXFLAGS")));
+    char *CFLAGS = strcpy(calloc(1024, 1), maybe(getenv("CFLAGS")));
+    char *LDFLAGS = strcpy(calloc(1024, 1), maybe(getenv("LDFLAGS")));
+    char *CC = strcpy(calloc(1024, 1), or_else(getenv("CC"), "clang"));
+    char *CXX = strcpy(calloc(1024, 1), or_else(getenv("CXX"), "clang++"));
+
+    // By default we use LTO, but Windows does not support it
+    if (!env_is("WITH_LTO", "0")) {
+        strcat(CXXFLAGS, " -flto");
+    }
+
+    // By default we use zlib but you can build without it (disables permessage-deflate)
+    if (!env_is("WITH_ZLIB", "0")) {
+        strcat(LDFLAGS, " -lz");
+    } else {
+        strcat(CXXFLAGS, " -DUWS_NO_ZLIB");
+    }
+
+    // WITH_PROXY enables PROXY Protocol v2 support
+    if (env_is("WITH_PROXY", "1")) {
+        strcat(CXXFLAGS, " -DUWS_WITH_PROXY");
+    }
+
+    // WITH_QUIC enables experimental Http3 examples
+    if (env_is("WITH_QUIC", "1")) {
+        strcat(CXXFLAGS, " -DLIBUS_USE_QUIC");
+        strcat(LDFLAGS, " -pthread -lz -lm uSockets/lsquic/src/liblsquic/liblsquic.a");
+    }
+
+    // Heavily prefer boringssl over openssl
+    if (env_is("WITH_BORINGSSL", "1")) {
+        strcat(CFLAGS, " -I uSockets/boringssl/include -pthread -DLIBUS_USE_OPENSSL");
+        strcat("LDFLAGS", " -pthread uSockets/boringssl/build/ssl/libssl.a uSockets/boringssl/build/crypto/libcrypto.a");
+    } else {
+        // WITH_OPENSSL=1 enables OpenSSL 1.1+ support
+        if (env_is("WITH_OPENSSL", "1")) {
+            // With problems on macOS, make sure to pass needed LDFLAGS required to find these
+            strcat(LDFLAGS, " -lssl -lcrypto");
+        } else {
+            // WITH_WOLFSSL=1 enables WolfSSL 4.2.0 support (mutually exclusive with OpenSSL)
+            if (env_is("WITH_WOLFSSL", "1")) {
+                strcat(LDFLAGS, " -L/usr/local/lib -lwolfssl");
+            }
+        }
+    }
+
+    // WITH_LIBUV=1 builds with libuv as event-loop
+    if (env_is("WITH_LIBUV", "1")) {
+        strcat(LDFLAGS, " -luv");
+    }
+
+    // WITH_ASIO=1 builds with ASIO as event-loop
+    if (env_is("WITH_ASIO", "1")) {
+        strcat(CXXFLAGS, " -pthread");
+        strcat(LDFLAGS, " -lpthread");
+    }
+
+    // WITH_ASAN builds with sanitizers
+    if (env_is("WITH_ASAN", "1")) {
+        strcat(CXXFLAGS, " -fsanitize=address -g");
+        strcat(LDFLAGS, " -lasan");
+    }
+
+    run("%s%s%s", CXX, CXXFLAGS, LDFLAGS);
+}
\ No newline at end of file
diff --git a/build.h b/build.h
new file mode 100644
index 0000000..4882f0d
--- /dev/null
+++ b/build.h
@@ -0,0 +1,26 @@
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+int env_is(char *env, char *target) {
+    char *val = getenv(env);
+    return val && !strcmp(val, target);
+}
+
+char *maybe(char *in) {
+    return in ? in : "";
+}
+
+char *or_else(char *in, char *otherwise) {
+    return in ? in : otherwise;
+}
+
+int run(const char *cmd, ...) {
+    char buf[2048];
+    va_list args;
+    va_start(args, cmd);
+    vsprintf(buf, cmd, args);
+    va_end(args);
+    printf("--> %s\n\n", buf);
+    return system(buf);
+}
\ No newline at end of file