FreeBSD compilation fixes

Based on patches provided in #6326, #6327, #6328, #6329

cmake-proxies/pffft/CMakeLists.txt

@@ -13,3 +13,4 @@ set(INCLUDES
 set_target_properties( ${TARGET} PROPERTIES FOLDER "lib-src" )
 target_sources( ${TARGET} PRIVATE ${SOURCES} )
 target_include_directories( ${TARGET} PUBLIC ${INCLUDES} )
+set_property(TARGET ${TARGET} PROPERTY POSITION_INDEPENDENT_CODE ON)

lib-src/libnyquist/nyquist/xlisp/path.c

@@ -25,6 +25,7 @@
  */
 
 #include <string.h>
+#include <stdint.h>
 
 #include "switches.h"
 #include "xlisp.h"

libraries/lib-basic-ui/BasicUI.cpp

@@ -29,6 +29,11 @@ Paul Licameli
 
 #include <string>
 
+#ifdef __FreeBSD__
+extern char** environ;
+#endif
+
+
 namespace
 {
 

src/ListNavigationPanel.h

@@ -13,7 +13,9 @@
 #include <wx/window.h>
 #include <wx/containr.h>
 
+#ifndef __FreeBSD__
 extern template class WXDLLIMPEXP_CORE wxNavigationEnabled<wxWindow>;
+#endif
 
 #include "ListNavigationEnabled.h"