From: Tom Hughes <[email-masked]>

Fix cross-compilation by removing gsl header/library check (these are enforced
through ebuild DEPENDS) and using AC_C_BIGENDIAN instead of the non-standard
AC_C_ENDIAN macro which tries to execute code.
--- a/configure.ac
+++ b/configure.ac
@@ -108,48 +108,7 @@
 AC_SUBST(DIEHARDER_LIBS)
 AC_SUBST(ACLOCAL_AMFLAGS)
 
-#==================================================================
-# Checks for libraries, and headers.  Test for dependency libraries
-# FIRST in reverse order that you need -lwhatever to appear on
-# compile line as it accumulates libraries to build e.g.
-#   -lgsl -lgslcblas
-# for the SECOND test, required (in that order) to succeed.
-#==================================================================
-AC_CHECK_HEADER([gsl/gsl_sf_gamma.h],,[AC_MSG_ERROR([Couldn't find GSL headers.  Please install the gsl-devel package.])])
-AC_CHECK_LIB([gslcblas], [main],,[AC_MSG_ERROR([Couldn't find libgsl. Please install the gsl package.])])
-AC_CHECK_LIB([gsl],[gsl_sf_gamma])
-
-
-#==================================================================
-# Check if we're a little-endian or a big-endian system, needed by
-# brg_endian.h in the build of rng_threefish.  This is a very
-# certain test, and therefore is checked FIRST in this header file.
-#==================================================================
-AC_DEFUN([AC_C_ENDIAN],
-[AC_CACHE_CHECK(for endianness, ac_cv_c_endian,
-[
-  AC_RUN_IFELSE(
-    [AC_LANG_PROGRAM([], [dnl
-        long val = 1;
-        char *c = (char *) &val;
-        exit(*c == 1);
-    ])
-  ],[
-    ac_cv_c_endian=big
-  ],[
-    ac_cv_c_endian=little
-  ])
-])
-if test $ac_cv_c_endian = big; then
-  AC_SUBST(LITTLE_ENDIAN,0) 
-fi
-if test $ac_cv_c_endian = little; then
-  AC_SUBST(LITTLE_ENDIAN,1) 
-fi
-])
-
-AC_C_ENDIAN
- 
+AC_C_BIGENDIAN([AC_SUBST(LITTLE_ENDIAN,0)],[AC_SUBST(LITTLE_ENDIAN,1)])
 
 #==================================================================
 # Checks for typedefs, structures, and compiler characteristics.