diff --git a/lang/cpp/src/gpgaddexistingsubkeyeditinteractor.h b/lang/cpp/src/gpgaddexistingsubkeyeditinteractor.h
--- a/lang/cpp/src/gpgaddexistingsubkeyeditinteractor.h
+++ b/lang/cpp/src/gpgaddexistingsubkeyeditinteractor.h
@@ -27,6 +27,7 @@
 #include "editinteractor.h"
 
 #include <memory>
+#include <string>
 
 namespace GpgME
 {
diff --git a/lang/cpp/src/gpgrevokekeyeditinteractor.h b/lang/cpp/src/gpgrevokekeyeditinteractor.h
--- a/lang/cpp/src/gpgrevokekeyeditinteractor.h
+++ b/lang/cpp/src/gpgrevokekeyeditinteractor.h
@@ -28,6 +28,7 @@
 #include "global.h"
 
 #include <memory>
+#include <string>
 #include <vector>
 
 namespace GpgME
diff --git a/lang/cpp/src/importresult.cpp b/lang/cpp/src/importresult.cpp
--- a/lang/cpp/src/importresult.cpp
+++ b/lang/cpp/src/importresult.cpp
@@ -35,7 +35,12 @@
 #include <cstring>
 
 #include <string.h>
-#include <strings.h>
+#ifdef _MSC_VER
+#  define strcasecmp _stricmp
+#  define strncasecmp _strnicmp
+#else
+#  include <strings.h>
+#endif
 #include <istream>
 #include <iterator>
 
diff --git a/lang/cpp/src/key.cpp b/lang/cpp/src/key.cpp
--- a/lang/cpp/src/key.cpp
+++ b/lang/cpp/src/key.cpp
@@ -34,7 +34,11 @@
 #include <gpgme.h>
 
 #include <string.h>
-#include <strings.h>
+#ifdef _MSC_VER
+#  define strcasecmp _stricmp
+#else
+#  include <strings.h>
+#endif
 #include <cassert>
 #include <istream>
 #include <iterator>
diff --git a/lang/qt/src/dn.cpp b/lang/qt/src/dn.cpp
--- a/lang/qt/src/dn.cpp
+++ b/lang/qt/src/dn.cpp
@@ -38,6 +38,10 @@
 
 #include "dn.h"
 
+#ifdef _MSC_VER
+#define strcasecmp _stricmp
+#endif
+
 #include <gpg-error.h>
 
 static const struct {