diff --git a/crypto/md5/md5.go b/crypto/md5/md5.go
index bc8ee86..fe6e700 100644
--- a/crypto/md5/md5.go
+++ b/crypto/md5/md5.go
@@ -15,6 +15,12 @@
 package md5
 
 // #include "../../shim.h"
+// #cgo linux CFLAGS: -Wno-deprecated-declarations -I/opt/tongsuo/include
+// #cgo linux LDFLAGS: -L/opt/tongsuo/lib -lssl -lcrypto
+// #cgo darwin CFLAGS: -I/opt/tongsuo/include -Wno-deprecated-declarations
+// #cgo darwin LDFLAGS: -L/opt/tongsuo/lib -lssl -lcrypto
+// #cgo windows CFLAGS: -DWIN32_LEAN_AND_MEAN
+// #cgo windows pkg-config: libssl libcrypto
 import "C"
 
 import (
diff --git a/crypto/sha1/sha1.go b/crypto/sha1/sha1.go
index 64f7fcc..66dd305 100644
--- a/crypto/sha1/sha1.go
+++ b/crypto/sha1/sha1.go
@@ -15,6 +15,12 @@
 package sha1
 
 // #include "../../shim.h"
+// #cgo linux CFLAGS: -Wno-deprecated-declarations -I/opt/tongsuo/include
+// #cgo linux LDFLAGS: -L/opt/tongsuo/lib -lssl -lcrypto
+// #cgo darwin CFLAGS: -I/opt/tongsuo/include -Wno-deprecated-declarations
+// #cgo darwin LDFLAGS: -L/opt/tongsuo/lib -lssl -lcrypto
+// #cgo windows CFLAGS: -DWIN32_LEAN_AND_MEAN
+// #cgo windows pkg-config: libssl libcrypto
 import "C"
 
 import (
diff --git a/crypto/sha256/sha256.go b/crypto/sha256/sha256.go
index 393a5aa..f0bf025 100644
--- a/crypto/sha256/sha256.go
+++ b/crypto/sha256/sha256.go
@@ -15,6 +15,12 @@
 package sha256
 
 // #include "../../shim.h"
+// #cgo linux CFLAGS: -Wno-deprecated-declarations -I/opt/tongsuo/include
+// #cgo linux LDFLAGS: -L/opt/tongsuo/lib -lssl -lcrypto
+// #cgo darwin CFLAGS: -I/opt/tongsuo/include -Wno-deprecated-declarations
+// #cgo darwin LDFLAGS: -L/opt/tongsuo/lib -lssl -lcrypto
+// #cgo windows CFLAGS: -DWIN32_LEAN_AND_MEAN
+// #cgo windows pkg-config: libssl libcrypto
 import "C"
 
 import (