diff --git a/configure.ac b/configure.ac
index 67c1f18..603e4cc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -48,7 +48,7 @@ dnl Libraries that may contain key functions.
 AC_SEARCH_LIBS([clock_gettime],[rt])
 
 dnl Items we can't do without.
-AC_CHECK_FUNCS([alarm basename clock_gettime dup2 getcwd memcpy memmove memset select setlocale strchr strerror strrchr strstr], [], [AC_MSG_ERROR([required function is missing])])
+AC_CHECK_FUNCS([alarm basename clock_gettime dup2 getcwd memcpy memmove memset mkdir select setlocale strchr strerror strrchr strstr], [], [AC_MSG_ERROR([required function is missing])])
 AC_CHECK_HEADERS([fcntl.h sys/file.h sys/time.h unistd.h], [], [AC_MSG_ERROR([required header file is missing])])
 
 dnl Make sure all the types we use are defined.
@@ -60,7 +60,9 @@ AC_TYPE_SIZE_T
 AC_TYPE_SSIZE_T
 AC_TYPE_UID_T
 
-dnl Check that a signal handler can't see the PID of the sender.
+AC_CHECK_MEMBERS([struct stat.st_rdev])
+
+dnl Check whether a signal handler can see the PID of the sender.
 AC_MSG_CHECKING([siginfo_t provides a signal sender's PID])
 AC_RUN_IFELSE(
 [AC_LANG_PROGRAM([[
diff --git a/src/include/config.h.in b/src/include/config.h.in
index 99b33cc..fcfb410 100644
--- a/src/include/config.h.in
+++ b/src/include/config.h.in
@@ -91,6 +91,9 @@
 /* Define to 1 if you have the <minix/config.h> header file. */
 #undef HAVE_MINIX_CONFIG_H
 
+/* Define to 1 if you have the `mkdir' function. */
+#undef HAVE_MKDIR
+
 /* Define to 1 if you have the `nanosleep' function. */
 #undef HAVE_NANOSLEEP
 
@@ -157,6 +160,9 @@
 /* Define to 1 if `st_blksize' is a member of `struct stat'. */
 #undef HAVE_STRUCT_STAT_ST_BLKSIZE
 
+/* Define to 1 if `st_rdev' is a member of `struct stat'. */
+#undef HAVE_STRUCT_STAT_ST_RDEV
+
 /* Define to 1 if you have the `sysconf' function. */
 #undef HAVE_SYSCONF
 
diff --git a/src/main/options.c b/src/main/options.c
index f374afa..53f7c63 100644
--- a/src/main/options.c
+++ b/src/main/options.c
@@ -19,10 +19,12 @@
 #include <sys/sysmacros.h>
 #ifdef major
 #ifdef minor
+#ifdef HAVE_STRUCT_STAT_ST_RDEV
 #define CAN_BUILD_SYSFS_FILENAME 1
 #endif
 #endif
 #endif
+#endif
 #include <fcntl.h>
 #include <unistd.h>
 #ifdef HAVE_GETOPT_H