I'm trying to compile GCC 4.7.2 on a [Buffalo LinkStation Pro Duo](http://www.buffalo-technology.com/en/linkstatio-pro-duo.html) (after [unlocking](http://buffalo.nas-central.org/wiki/Open_Stock_Firmware_LS-VL) it) which runs Linux 2.6.31.8 armv5tel.

Unfortunately, `make` throws quite some errors, starting with

```
gcc -c  -DIN_GCC_FRONTEND -g -fkeep-inline-functions -DIN_GCC   -W -Wall -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wmissing-formIn file included from ../../gcc-4.7.2/gcc/tree.h:32,
                 from ../../gcc-4.7.2/gcc/c-lang.c:27:
../../gcc-4.7.2/gcc/real.h:53: error: 'SIZEOF_LONG' undeclared here (not in a function)
In file included from ../../gcc-4.7.2/gcc/tree.h:32,
                 from ../../gcc-4.7.2/gcc/c-lang.c:27:
../../gcc-4.7.2/gcc/real.h:87:5: error: division by zero in #if
../../gcc-4.7.2/gcc/real.h:87:5: error: division by zero in #if
../../gcc-4.7.2/gcc/real.h:90:6: error: division by zero in #if

```

Line 53 of `real.h` reads `unsigned long sig[SIGSZ];`, where `SIGSZ` is defined at line 40 as  

`#define SIGSZ (SIGNIFICAND_BITS / HOST_BITS_PER_LONG)`  

while line 87 is `#if REAL_WIDTH == 1` with `REAL_WIDTH` defined starting at line 72 as  

`#define REAL_WIDTH \  

 (REAL_VALUE_TYPE_SIZE/HOST_BITS_PER_WIDE_INT \  

 + (REAL_VALUE_TYPE_SIZE%HOST_BITS_PER_WIDE_INT ? 1 : 0)) /* round up */`

This seems to boil down to the `HOST_BITS_PER_*` being zero. Do I have to define these manually with some `configure` parameter or how can this issue be resolved?

---

**update**

`config.log` contains the following errors:

```
conftest.c:10:19: error: ppl_c.h: No such file or directory
conftest.c: In function 'main':
conftest.c:16: error: 'choke' undeclared (first use in this function)
conftest.c:16: error: (Each undeclared identifier is reported only once
conftest.c:16: error: for each function it appears in.)
conftest.c:16: error: expected ';' before 'me'
configure:5708: $? = 1
configure: failed program was:
| /* confdefs.h */
| #define PACKAGE_NAME ""
| #define PACKAGE_TARNAME ""
| #define PACKAGE_VERSION ""
| #define PACKAGE_STRING ""
| #define PACKAGE_BUGREPORT ""
| #define PACKAGE_URL ""
| #define LT_OBJDIR ".libs/"
| /* end confdefs.h.  */
| #include "ppl_c.h"
| int
| main ()
| {
|.
|     #if PPL_VERSION_MAJOR != 0 || PPL_VERSION_MINOR < 11
|     choke me
|     #endif
|.
|   ;
|   r

```

Following [this post](https://groups.google.com/forum/?fromgroups=#!topic/gnu.gcc.help/72AMJrsw-IU) I seem to have forgotten to install [ppl](http://bugseng.com/products/ppl/Download/), which I'll try now