diff --git a/configure.ac b/configure.ac
index 180dd2d056..3af440e542 100644
--- a/configure.ac
+++ b/configure.ac
@@ -959,7 +959,7 @@ AC_MSG_CHECKING(for working sem_init())
 AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <semaphore.h>
 	main () {
 		sem_t s;
-		exit(sem_init(&s,0,0));
+		return sem_init(&s,0,0);
 		}
 	]])],[AC_DEFINE(WORKING_SEM_INIT,1,[Define this if sem_init() works on the platform])
 AC_MSG_RESULT(yes)],[AC_MSG_RESULT(no)
@@ -991,7 +991,7 @@ if test "$ac_cv_sys_file_offset_bits" = "no"; then
   AC_MSG_CHECKING(for native large file support)
   AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <unistd.h>
     main () {
-    exit(!(sizeof(off_t) == 8));
+    return !(sizeof(off_t) == 8);
   }]])],[ac_cv_sys_file_offset_bits=64; AC_DEFINE(_FILE_OFFSET_BITS,64)
    AC_MSG_RESULT(yes)],[AC_MSG_RESULT(no)],[])
 fi
@@ -1033,7 +1033,7 @@ main () {
     char a;
     union { long long x; sem_t y; } b;
   };
-  exit((int)&((struct s*)0)->b);
+  return (int)&((struct s*)0)->b;
 }]])],[ac_cv_c_alignment=$ac_status],[ac_cv_c_alignment=$ac_status],[])
 AC_MSG_RESULT($ac_cv_c_alignment)
 AC_DEFINE_UNQUOTED(FB_ALIGNMENT, $ac_cv_c_alignment, [Alignment of long])
@@ -1044,7 +1044,7 @@ AC_RUN_IFELSE([AC_LANG_SOURCE([[main () {
     char a;
     double b;
   };
-  exit((int)&((struct s*)0)->b);
+  return (int)&((struct s*)0)->b;
 }]])],[ac_cv_c_double_align=$ac_status],[ac_cv_c_double_align=$ac_status],[])
 AC_MSG_RESULT($ac_cv_c_double_align)
 AC_DEFINE_UNQUOTED(FB_DOUBLE_ALIGN, $ac_cv_c_double_align, [Alignment of double])