supertux 0.4 ubuntu 15.10 iconv issue

snadge@octokang:/usr/src/supertux-0.4.0/build$ cat CMakeFiles/CMakeError.log
Determining if the system is big endian passed with the following output:
Change Dir: /usr/src/supertux-0.4.0/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTryCompileExec1264574968/fast"
/usr/bin/make -f CMakeFiles/cmTryCompileExec1264574968.dir/build.make CMakeFiles/cmTryCompileExec1264574968.dir/build
make[1]: Entering directory '/usr/src/supertux-0.4.0/build/CMakeFiles/CMakeTmp'
/usr/bin/cmake -E cmake_progress_report /usr/src/supertux-0.4.0/build/CMakeFiles/CMakeTmp/CMakeFiles 1
Building C object CMakeFiles/cmTryCompileExec1264574968.dir/TestEndianess.c.o
/usr/bin/cc    -o CMakeFiles/cmTryCompileExec1264574968.dir/TestEndianess.c.o   -c /usr/src/supertux-0.4.0/build/CMakeFiles/CMakeTmp/TestEndianess.c
Linking C executable cmTryCompileExec1264574968
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTryCompileExec1264574968.dir/link.txt --verbose=1
/usr/bin/cc       CMakeFiles/cmTryCompileExec1264574968.dir/TestEndianess.c.o  -o cmTryCompileExec1264574968 -rdynamic
make[1]: Leaving directory '/usr/src/supertux-0.4.0/build/CMakeFiles/CMakeTmp'

TestEndianess.c:
/* A 16 bit integer is required. */
typedef unsigned short cmakeint16;

/* On a little endian machine, these 16bit ints will give "THIS IS LITTLE ENDIAN."
   On a big endian machine the characters will be exchanged pairwise. */
const cmakeint16 info_little[] =  {0x4854, 0x5349, 0x4920, 0x2053, 0x494c, 0x5454, 0x454c, 0x4520, 0x444e, 0x4149, 0x2e4e, 0x0000};

/* on a big endian machine, these 16bit ints will give "THIS IS BIG ENDIAN."
   On a little endian machine the characters will be exchanged pairwise. */
const cmakeint16 info_big[] =     {0x5448, 0x4953, 0x2049, 0x5320, 0x4249, 0x4720, 0x454e, 0x4449, 0x414e, 0x2e2e, 0x0000};

#ifdef __CLASSIC_C__
int main(argc, argv) int argc; char *argv[];
#else
int main(int argc, char *argv[])
#endif
{
  int require = 0;
  require += info_little[argc];
  require += info_big[argc];
  (void)argv;
  return require;
}


Performing C++ SOURCE FILE Test HAVE_ICONV_CONST failed with the following output:
Change Dir: /usr/src/supertux-0.4.0/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTryCompileExec1852920673/fast"
/usr/bin/make -f CMakeFiles/cmTryCompileExec1852920673.dir/build.make CMakeFiles/cmTryCompileExec1852920673.dir/build
make[1]: Entering directory '/usr/src/supertux-0.4.0/build/CMakeFiles/CMakeTmp'
/usr/bin/cmake -E cmake_progress_report /usr/src/supertux-0.4.0/build/CMakeFiles/CMakeTmp/CMakeFiles 1
Building CXX object CMakeFiles/cmTryCompileExec1852920673.dir/src.cxx.o
/usr/bin/c++    -DHAVE_ICONV_CONST   -o CMakeFiles/cmTryCompileExec1852920673.dir/src.cxx.o -c /usr/src/supertux-0.4.0/build/CMakeFiles/CMakeTmp/src.cxx
/usr/src/supertux-0.4.0/build/CMakeFiles/CMakeTmp/src.cxx:4:98: error: ambiguating new declaration of ‘double iconv(iconv_t, char**, size_t*, char**, size_t*)’
  double iconv(iconv_t cd,  char **inbuf, size_t *inbytesleft, char **outbuf, size_t *outbytesleft);
                                                                                                  ^
In file included from /usr/src/supertux-0.4.0/build/CMakeFiles/CMakeTmp/src.cxx:2:0:
/usr/include/iconv.h:42:15: note: old declaration ‘size_t iconv(iconv_t, char**, size_t*, char**, size_t*)’
 extern size_t iconv (iconv_t __cd, char **__restrict __inbuf,
               ^
CMakeFiles/cmTryCompileExec1852920673.dir/build.make:57: recipe for target 'CMakeFiles/cmTryCompileExec1852920673.dir/src.cxx.o' failed
make[1]: Leaving directory '/usr/src/supertux-0.4.0/build/CMakeFiles/CMakeTmp'
make[1]: *** [CMakeFiles/cmTryCompileExec1852920673.dir/src.cxx.o] Error 1
Makefile:117: recipe for target 'cmTryCompileExec1852920673/fast' failed
make: *** [cmTryCompileExec1852920673/fast] Error 2

Source file was:

	#include <iconv.h>
	// this declaration will fail when there already exists a non const char** version which returns size_t
	double iconv(iconv_t cd,  char **inbuf, size_t *inbytesleft, char **outbuf, size_t *outbytesleft);
	int main() { return 0; }