diff --git a/auto/os/features b/auto/os/features
index 5fcbf7f6b..ecb210da6 100644
--- a/auto/os/features
+++ b/auto/os/features
@@ -98,7 +98,7 @@ if test -z "$NGX_KQUEUE_CHECKED"; then
         ngx_feature_name="NGX_HAVE_TIMER_EVENT"
         ngx_feature_run=yes
         ngx_feature_incs="#include <sys/event.h>
-#include <sys/time.h>"
+                          #include <sys/time.h>"
         ngx_feature_path=
         ngx_feature_libs=
         ngx_feature_test="int      kq;
diff --git a/auto/os/linux b/auto/os/linux
index 3c2c8419d..580a92ada 100644
--- a/auto/os/linux
+++ b/auto/os/linux
@@ -65,7 +65,7 @@ ngx_feature="sendfile()"
 ngx_feature_name="NGX_HAVE_SENDFILE"
 ngx_feature_run=yes
 ngx_feature_incs="#include <sys/sendfile.h>
-#include <errno.h>"
+                  #include <errno.h>"
 ngx_feature_path=
 ngx_feature_libs=
 ngx_feature_test="int s = 0, fd = 1;
@@ -86,7 +86,7 @@ ngx_feature="sendfile64()"
 ngx_feature_name="NGX_HAVE_SENDFILE64"
 ngx_feature_run=yes
 ngx_feature_incs="#include <sys/sendfile.h>
-#include <errno.h>"
+                  #include <errno.h>"
 ngx_feature_path=
 ngx_feature_libs=
 ngx_feature_test="int s = 0, fd = 1;
diff --git a/auto/unix b/auto/unix
index 7d6e4805e..447b0e2d3 100755
--- a/auto/unix
+++ b/auto/unix
@@ -190,8 +190,8 @@ ngx_feature='mmap("/dev/zero", MAP_SHARED)'
 ngx_feature_name="NGX_HAVE_MAP_DEVZERO"
 ngx_feature_run=yes
 ngx_feature_incs="#include <sys/mman.h>
-#include <sys/stat.h>
-#include <fcntl.h>"
+                  #include <sys/stat.h>
+                  #include <fcntl.h>"
 ngx_feature_path=
 ngx_feature_libs=
 ngx_feature_test='void *p; int  fd;
@@ -205,7 +205,7 @@ ngx_feature="System V shared memory"
 ngx_feature_name="NGX_HAVE_SYSVSHM"
 ngx_feature_run=yes
 ngx_feature_incs="#include <sys/ipc.h>
-#include <sys/shm.h>"
+                  #include <sys/shm.h>"
 ngx_feature_path=
 ngx_feature_libs=
 ngx_feature_test="int  id;
@@ -229,7 +229,7 @@ ngx_feature="ioctl(FIONBIO)"
 ngx_feature_name="NGX_HAVE_FIONBIO"
 ngx_feature_run=no
 ngx_feature_incs="#include <sys/ioctl.h>
-$NGX_INCLUDE_SYS_FILIO_H"
+                  $NGX_INCLUDE_SYS_FILIO_H"
 ngx_feature_path=
 ngx_feature_libs=
 ngx_feature_test="int i; i = FIONBIO"