diff -urN scilab-5.2.1-orig//configure.ac scilab-5.2.1//configure.ac
--- scilab-5.2.1-orig//configure.ac	2010-02-17 03:06:08.000000000 -0500
+++ scilab-5.2.1//configure.ac	2010-02-20 16:49:52.000000000 -0500
@@ -953,12 +953,7 @@
 # Provided by math.h
 
 LDFLAGS="$LDFLAGS $LIBM"
-AC_CHECK_FUNCS([pow] [sqrt] [finite] [floor])
-
-AC_CHECK_FUNC([exp10],,[
-				AC_DEFINE([log_10_],[2.3025850929940456840179914546844],[Provide a macro to do exp10])
-				AC_DEFINE([exp10(x)],[exp( (log_10_) * (x) )],[Provide a macro to do exp10])
-				])
+AC_CHECK_FUNCS([pow] [sqrt] [finite] [floor] [exp10])
 
 ### If isinf exists or not (used to not be the case under Solaris)
 ### See bug #4164
diff -urN scilab-5.2.1-orig//modules/core/includes/core_math.h scilab-5.2.1//modules/core/includes/core_math.h
--- scilab-5.2.1-orig//modules/core/includes/core_math.h	2010-02-17 03:06:08.000000000 -0500
+++ scilab-5.2.1//modules/core/includes/core_math.h	2010-02-20 16:49:52.000000000 -0500
@@ -90,6 +90,11 @@
 #define M_PI 3.14159265358979323846 
 #endif
 
+#ifndef HAVE_EXP10
+#define log_10_ 2.3025850929940456840179914546844
+/* Provide a macro to do exp10 */
+#define exp10(x) exp( (log_10_) * (x) )
+#endif
 
 #endif /* __BASE_MATH_H__ */
 
diff -urN scilab-5.2.1-orig//modules/core/includes/machine.h.in scilab-5.2.1//modules/core/includes/machine.h.in
--- scilab-5.2.1-orig//modules/core/includes/machine.h.in	2010-02-17 03:06:08.000000000 -0500
+++ scilab-5.2.1//modules/core/includes/machine.h.in	2010-02-20 16:49:52.000000000 -0500
@@ -77,6 +77,9 @@
 /* Define to 1 if you have the `endpwent' function. */
 #undef HAVE_ENDPWENT
 
+/* Define to 1 if you have the `exp10' function. */
+#undef HAVE_EXP10
+
 /* Define to 1 if you have the <fcntl.h> header file. */
 #undef HAVE_FCNTL_H
 
@@ -515,9 +518,6 @@
 /* Define to empty if `const' does not conform to ANSI C. */
 #undef const
 
-/* Provide a macro to do exp10 */
-#undef exp10
-
 /* Don't use getwd but getcwd */
 #undef getwd
 
@@ -530,9 +530,6 @@
 /* Provide a macro to do isinf */
 #undef isinf
 
-/* Provide a macro to do exp10 */
-#undef log_10_
-
 
 
 #ifdef DIR_SEPARATOR