fix for "matheval.c:37:2: error: #error Neither scm_num2dbl() nor SCM_NUM2DBL available"
patch obtained via https://aur.archlinux.org/cgit/aur.git/tree/removeifndefs.patch?h=libmatheval
diff -aur a/tests/matheval.c b/tests/matheval.c
--- a/tests/matheval.c	2016-03-24 13:55:00.163074189 +0000
+++ b/tests/matheval.c	2016-03-24 13:52:59.492996682 +0000
@@ -26,26 +26,6 @@
 #include <matheval.h>
 #include "config.h"
 
-#ifndef HAVE_SCM_T_BITS
-typedef long    scm_t_bits;
-#endif
-
-#ifndef HAVE_SCM_NUM2DBL
-#ifdef SCM_NUM2DBL
-#define scm_num2dbl(x,s) SCM_NUM2DBL(x)
-#else
-#error Neither scm_num2dbl() nor SCM_NUM2DBL available
-#endif
-#endif
-
-#ifndef HAVE_SCM_C_DEFINE_GSUBR
-#ifdef HAVE_SCM_MAKE_GSUBR
-#define scm_c_define_gsubr scm_make_gsubr
-#else
-#error Neither scm_c_define_gsubr() nor scm_make_gsubr() available
-#endif
-#endif
-
 static scm_t_bits evaluator_tag;	/* Unique identifier for Guile
 					 * objects of evaluator type.  */