diff --git a/filesystem/dfs/SConscript b/filesystem/dfs/SConscript
new file mode 100644
index 0000000000000000000000000000000000000000..a53a8dca23665914fa93782ba818a49dd34bc7a2
--- /dev/null
+++ b/filesystem/dfs/SConscript
@@ -0,0 +1,76 @@
+Import('env')
+Import('rtconfig')
+Import('RTT_ROOT')
+
+dfs = Split("""
+src/dfs_cache.c
+src/dfs_fs.c
+src/dfs_init.c
+src/dfs_posix.c
+src/dfs_raw.c
+src/dfs_util.c
+""")
+
+# DFS-FatFs options
+fatfs = Split("""
+filesystems/fatfs/fatfs_cache.c
+filesystems/fatfs/fatfs_direntry.c
+filesystems/fatfs/fatfs_fat.c
+filesystems/fatfs/fatfs_file.c
+filesystems/fatfs/fatfs_filename.c
+filesystems/fatfs/fatfs_init.c
+filesystems/fatfs_misc.c
+filesystems/fatfs/fatfs_mount.c""")
+
+# DFS-EFSL options
+efsl = Split("""
+filesystems/efsl/src/base/efs.c
+filesystems/efsl/src/base/extract.c
+filesystems/efsl/src/base/partition.c
+filesystems/efsl/src/base/plibc.c
+filesystems/efsl/src/fs/vfat/dir.c
+filesystems/efsl/src/fs/vfat/fat.c
+filesystems/efsl/src/fs/vfat/file.c
+filesystems/efsl/src/fs/vfat/fs.c
+filesystems/efsl/src/fs/vfat/ls.c
+filesystems/efsl/src/fs/vfat/time.c
+filesystems/efsl/src/fs/vfat/ui.c
+""")
+
+# DFS-YAFFS2 options
+yaffs2_main = Split("""
+filesystems/yaffs2/direct/yaffscfg.c
+filesystems/yaffs2/direct/yaffs_fileem.c
+filesystems/yaffs2/direct/yaffsfs.c
+filesystems/yaffs2/direct/dfs_yaffs2.c
+""")
+
+yaffs2_comm = Split("""
+filesystems/yaffs2/yaffs_ecc.c
+filesystems/yaffs2/yaffs_guts.c
+filesystems/yaffs2/yaffs_packedtags1.c
+filesystems/yaffs2/yaffs_tagscompat.c
+filesystems/yaffs2/yaffs_packedtags2.c
+filesystems/yaffs2/yaffs_tagsvalidity.c
+filesystems/yaffs2/yaffs_nand.c
+filesystems/yaffs2/yaffs_checkptrw.c
+filesystems/yaffs2/yaffs_qsort.c
+""")
+
+# The set of source files associated with this SConscript file.
+src_local = dfs
+path = [RTT_ROOT + '/filesystem/dfs', RTT_ROOT + '/filesystem/dfs/include']
+
+if rtconfig.RT_USING_DFS_YAFFS2:
+    src_local = src_local + yaffs2_main + yaffs2_comm
+    path = path + [RTT_ROOT + '/filesystem/dfs/filesystems/yaffs2', RTT_ROOT + '/filesystem/dfs/filesystems/yaffs2/direct']
+
+if rtconfig.RT_USING_DFS_EFSL:
+    src_local = src_local + efsl
+    path = path + [RTT_ROOT + '/filesystem/dfs/filesystems/efsl/src/include', RTT_ROOT + '/filesystem/dfs/filesystems/efsl/src/base/include', RTT_ROOT + '/filesystem/dfs/filesystems/efsl/src/fs/vfat/include']
+
+env.Append(CPPPATH = path)
+
+obj = env.Object(src_local)
+
+Return('obj')
diff --git a/finsh/SConscript b/finsh/SConscript
index 6e71c13fc3fee7082324e45f9b18add43e7fd55b..0a638c10aac942b79ad7938d46c6229a9998bbc6 100644
--- a/finsh/SConscript
+++ b/finsh/SConscript
@@ -1,7 +1,10 @@
 Import('env')
+Import('RTT_ROOT')
 
 # The set of source files associated with this SConscript file.
 src_local = Glob('*.c')
 
+env.Append(CPPPATH = RTT_ROOT + '/finsh')
+
 obj = env.Object(src_local)
 Return('obj')
diff --git a/libc/minilibc/SConscript b/libc/minilibc/SConscript
index 6e71c13fc3fee7082324e45f9b18add43e7fd55b..729d2fea00bcae93a7c9905ade60b34be43a00ae 100644
--- a/libc/minilibc/SConscript
+++ b/libc/minilibc/SConscript
@@ -1,7 +1,10 @@
 Import('env')
+Import('RTT_ROOT')
 
 # The set of source files associated with this SConscript file.
 src_local = Glob('*.c')
 
+env.Append(CPPPATH = RTT_ROOT + '/libc/minilibc')
+
 obj = env.Object(src_local)
 Return('obj')
diff --git a/libc/minilibc/time.c b/libc/minilibc/time.c
new file mode 100644
index 0000000000000000000000000000000000000000..4c39c3c25d455c64ebd29f8430fcf453676002bb
--- /dev/null
+++ b/libc/minilibc/time.c
@@ -0,0 +1,174 @@
+#include <time.h>
+
+/* days per month -- nonleap! */
+const short __spm[13] =
+  { 0,
+    (31),
+    (31+28),
+    (31+28+31),
+    (31+28+31+30),
+    (31+28+31+30+31),
+    (31+28+31+30+31+30),
+    (31+28+31+30+31+30+31),
+    (31+28+31+30+31+30+31+31),
+    (31+28+31+30+31+30+31+31+30),
+    (31+28+31+30+31+30+31+31+30+31),
+    (31+28+31+30+31+30+31+31+30+31+30),
+    (31+28+31+30+31+30+31+31+30+31+30+31),
+  };
+static long int timezone;
+static const char days[] = "Sun Mon Tue Wed Thu Fri Sat ";
+static const char months[] = "Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ";
+
+/* seconds per day */
+#define SPD 24*60*60
+
+int __isleap(int year) {
+  /* every fourth year is a leap year except for century years that are
+   * not divisible by 400. */
+/*  return (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)); */
+  return (!(year%4) && ((year%100) || !(year%400)));
+}
+
+struct tm *gmtime_r(const time_t *timep, struct tm *r) {
+  time_t i;
+  register time_t work=*timep%(SPD);
+  r->tm_sec=work%60; work/=60;
+  r->tm_min=work%60; r->tm_hour=work/60;
+  work=*timep/(SPD);
+  r->tm_wday=(4+work)%7;
+  for (i=1970; ; ++i) {
+    register time_t k=__isleap(i)?366:365;
+    if (work>=k)
+      work-=k;
+    else
+      break;
+  }
+  r->tm_year=i-1900;
+  r->tm_yday=work;
+
+  r->tm_mday=1;
+  if (__isleap(i) && (work>58)) {
+    if (work==59) r->tm_mday=2; /* 29.2. */
+    work-=1;
+  }
+
+  for (i=11; i && (__spm[i]>work); --i) ;
+  r->tm_mon=i;
+  r->tm_mday+=work-__spm[i];
+  return r;
+}
+
+struct tm* localtime_r(const time_t* t, struct tm* r) {
+  time_t tmp;
+  struct timezone tz;
+  gettimeofday(0, &tz);
+  timezone=tz.tz_minuteswest*60L;
+  tmp=*t+timezone;
+  return gmtime_r(&tmp,r);
+}
+
+struct tm* localtime(const time_t* t) {
+  static struct tm tmp;
+  return localtime_r(t,&tmp);
+}
+
+time_t timegm(struct tm *const t) {
+  register time_t  day;
+  register time_t  i;
+  register time_t years = t->tm_year - 70;
+
+  if (t->tm_sec>60) { t->tm_min += t->tm_sec/60; t->tm_sec%=60; }
+  if (t->tm_min>60) { t->tm_hour += t->tm_min/60; t->tm_min%=60; }
+  if (t->tm_hour>60) { t->tm_mday += t->tm_hour/60; t->tm_hour%=60; }
+  if (t->tm_mon>12) { t->tm_year += t->tm_mon/12; t->tm_mon%=12; }
+  while (t->tm_mday>__spm[1+t->tm_mon]) {
+    if (t->tm_mon==1 && __isleap(t->tm_year+1900)) {
+      if (t->tm_mon==31+29) break;
+      --t->tm_mday;
+    }
+    t->tm_mday-=__spm[t->tm_mon];
+    ++t->tm_mon;
+    if (t->tm_mon>11) { t->tm_mon=0; ++t->tm_year; }
+  }
+
+  if (t->tm_year < 70)
+    return (time_t) -1;
+
+  /* Days since 1970 is 365 * number of years + number of leap years since 1970 */
+  day  = years * 365 + (years + 1) / 4;
+
+  /* After 2100 we have to substract 3 leap years for every 400 years
+     This is not intuitive. Most mktime implementations do not support
+     dates after 2059, anyway, so we might leave this out for it's
+     bloat. */
+  if ((years -= 131) >= 0) {
+    years /= 100;
+    day -= (years >> 2) * 3 + 1;
+    if ((years &= 3) == 3) years--;
+    day -= years;
+  }
+
+  day += t->tm_yday = __spm [t->tm_mon] + t->tm_mday-1 + ( __isleap (t->tm_year+1900)  &  (t->tm_mon > 1) );
+
+  /* day is now the number of days since 'Jan 1 1970' */
+  i = 7;
+  t->tm_wday = (day + 4) % i;                        /* Sunday=0, Monday=1, ..., Saturday=6 */
+
+  i = 24;
+  day *= i;
+  i = 60;
+  return ((day + t->tm_hour) * i + t->tm_min) * i + t->tm_sec;
+}
+
+time_t mktime(register struct tm* const t) {
+  time_t x=timegm(t);
+  struct timezone tz;
+  gettimeofday(0, &tz);
+  timezone=tz.tz_minuteswest*60L;
+  x+=timezone;
+  return x;
+}
+
+static void num2str(char *c,int i) {
+  c[0]=i/10+'0';
+  c[1]=i%10+'0';
+}
+
+char *asctime_r(const struct tm *t, char *buf) {
+  /* "Wed Jun 30 21:49:08 1993\n" */
+  *(int*)buf=*(int*)(days+(t->tm_wday<<2));
+  *(int*)(buf+4)=*(int*)(months+(t->tm_mon<<2));
+  num2str(buf+8,t->tm_mday);
+  if (buf[8]=='0') buf[8]=' ';
+  buf[10]=' ';
+  num2str(buf+11,t->tm_hour);
+  buf[13]=':';
+  num2str(buf+14,t->tm_min);
+  buf[16]=':';
+  num2str(buf+17,t->tm_sec);
+  buf[19]=' ';
+  num2str(buf+20,(t->tm_year+1900)/100);
+  num2str(buf+22,(t->tm_year+1900)%100);
+  buf[24]='\n';
+  return buf;
+}
+
+char *asctime(const struct tm *timeptr) {
+  static char buf[25];
+  return asctime_r(timeptr,buf);
+}
+
+char *ctime(const time_t *timep) {
+  return asctime(localtime(timep));
+}
+
+int gettimeofday (struct timeval *tp, void *ignore)
+{
+     time_t t;
+
+     t = time(NULL);
+     tp->tv_sec  = t;
+     tp->tv_usec = 0;
+     return 0;
+}
diff --git a/libcpu/SConscript b/libcpu/SConscript
index 1ea8ff784cdf967352f57be36dd1b1e8f2d491ac..4fea9186032e76daa8316b8ed685b312e8dc9f9c 100644
--- a/libcpu/SConscript
+++ b/libcpu/SConscript
@@ -11,5 +11,8 @@ if rtconfig.CC == 'armcc':
 if rtconfig.CC == 'gcc':
 	src_local = Glob(path + '/*.c') + Glob(path + '/*_gcc.s') + Glob(comm + '/*.c')
 
+if rtconfig.CC == 'iar':
+	src_local = Glob(path + '/*.c') + Glob(path + '/*_iar.s') + Glob(comm + '/*.c')
+
 obj = env.Object(src_local)
 Return('obj')
diff --git a/net/lwip/SConscript b/net/lwip/SConscript
index 92dff9559e4751d800143336f36ec1eb718fbcca..8c1d1cc4740af54af2ae0a6d42c46329f2db6105 100644
--- a/net/lwip/SConscript
+++ b/net/lwip/SConscript
@@ -62,8 +62,8 @@ src/netif/ppp/vj.c
 # The set of source files associated with this SConscript file.
 path = [RTT_ROOT + '/net/lwip/src/include', RTT_ROOT + '/net/lwip/src/include/ipv4', RTT_ROOT + '/net/lwip/src/arch/include/arch', RTT_ROOT + '/net/lwip/src/include/netif', RTT_ROOT + '/net/lwip/src/netif/ppp']
 
-lwip_env = env.Clone()
-lwip_env.Append(CPPPATH = path)
+env.Clone()
+env.Append(CPPPATH = path)
 
 obj = lwip_env.Object(src_local)