diff --git a/build_state b/build_state
new file mode 100644
index 0000000..8042e92
--- /dev/null
+++ b/build_state
@@ -0,0 +1 @@
+,,,cc,,
diff --git a/glava/glava.h b/glava/glava.h
index 570abc3..a043d52 100644
--- a/glava/glava.h
+++ b/glava/glava.h
@@ -14,8 +14,8 @@ struct glava_renderer;
 /* External API */
 
 typedef struct glava_renderer* volatile glava_handle;
-__attribute__((noreturn, visibility("default"))) void (*glava_abort)            (void);
-__attribute__((noreturn, visibility("default"))) void (*glava_return)           (void);
+extern __attribute__((noreturn, visibility("default"))) void (*glava_abort)            (void);
+extern __attribute__((noreturn, visibility("default"))) void (*glava_return)           (void);
 __attribute__((visibility("default")))           void glava_assign_external_ctx (void* ctx);
 __attribute__((visibility("default")))           void glava_entry               (int argc, char** argv, glava_handle* ret);
 __attribute__((visibility("default")))           void glava_terminate           (glava_handle* ref);
diff --git a/glfft/glfft_gl_interface.cpp b/glfft/glfft_gl_interface.cpp
index 47e7ef4..55d54fc 100644
--- a/glfft/glfft_gl_interface.cpp
+++ b/glfft/glfft_gl_interface.cpp
@@ -24,6 +24,10 @@
 #include <cstring>
 #include <vector>
 
+#include <cstdio>  // for stdout, stderr, vfprintf, fprintf, vsnprintf
+#include <cerrno>  // for errno
+#include <cstring> // for strerror
+
 using namespace GLFFT;
 using namespace std;
 
diff --git a/glfft/glfft_gl_interface.hpp b/glfft/glfft_gl_interface.hpp
index 43929c7..f209f06 100644
--- a/glfft/glfft_gl_interface.hpp
+++ b/glfft/glfft_gl_interface.hpp
@@ -23,6 +23,10 @@
 
 #include "glfft_gl_api_headers.hpp"
 
+#include <cstdio>  // for stdout, stderr, vfprintf, fprintf, vsnprintf
+#include <cerrno>  // for errno
+#include <cstring> // for strerror
+
 /* GLava additions (POSIX) */
 extern "C" {
     #include <time.h>
diff --git a/glfft/glfft_wisdom.cpp b/glfft/glfft_wisdom.cpp
index ad18317..2251fe7 100644
--- a/glfft/glfft_wisdom.cpp
+++ b/glfft/glfft_wisdom.cpp
@@ -21,6 +21,8 @@
 #include "glfft.hpp"
 #include <utility>
 
+#include <stdexcept> // for std::logic_error
+
 /* GLAVA NOTICE: automatic wisdom serialization support may be added at a late date */
 #ifdef GLFFT_SERIALIZATION
 #include "rapidjson/reader.h"