revert math library check

configure

@@ -5126,7 +5126,7 @@ MAGICK_PATCHLEVEL_VERSION=94
 
 MAGICK_VERSION=6.9.12-94
 
-MAGICK_GIT_REVISION=101d01aa2:20230910
+MAGICK_GIT_REVISION=1a52f3f21:20230910
 
 
 # Substitute library versioning
@@ -26169,28 +26169,46 @@ fi
 # Find math library
 #
 MATH_LIBS=''
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for sqrt in -lm" >&5
+printf %s "checking for sqrt in -lm... " >&6; }
+if test ${ac_cv_lib_m_sqrt+y}
+then :
+  printf %s "(cached) " >&6
+else $as_nop
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lm  $LIBS"
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
-
-    #include <math.h>
-
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+char sqrt ();
 int
 main (void)
 {
-
-    double x = sqrt(2.0);
-
+return sqrt ();
   ;
   return 0;
 }
-
 _ACEOF
-if ac_fn_c_try_compile "$LINENO"
+if ac_fn_c_try_link "$LINENO"
+then :
+  ac_cv_lib_m_sqrt=yes
+else $as_nop
+  ac_cv_lib_m_sqrt=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_m_sqrt" >&5
+printf "%s\n" "$ac_cv_lib_m_sqrt" >&6; }
+if test "x$ac_cv_lib_m_sqrt" = xyes
 then :
   MATH_LIBS="-lm"
 fi
-rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
+
 LIBS="$MATH_LIBS $LIBS"
 
 

configure.ac

@@ -1060,13 +1060,7 @@ AC_FUNC_STRERROR_R
 # Find math library
 #
 MATH_LIBS=''
-AC_COMPILE_IFELSE([
-  AC_LANG_PROGRAM([[
-    #include <math.h>
-  ]], [[
-    double x = sqrt(2.0);
-  ]])
-], [MATH_LIBS="-lm"], [])
+AC_CHECK_LIB([m],[sqrt],[MATH_LIBS="-lm"],[])
 LIBS="$MATH_LIBS $LIBS"
 AC_SUBST([MATH_LIBS])