--- a/auto/cc/name
+++ b/auto/cc/name
@@ -7,7 +7,7 @@ if [ "$NGX_PLATFORM" != win32 ]; then
 
     ngx_feature="C compiler"
     ngx_feature_name=
-    ngx_feature_run=yes
+    ngx_feature_run=
     ngx_feature_incs=
     ngx_feature_path=
     ngx_feature_libs=
--- a/auto/cc/conf
+++ b/auto/cc/conf
@@ -155,7 +155,7 @@ if [ "$NGX_PLATFORM" != win32 ]; then
     else
         ngx_feature="C99 variadic macros"
         ngx_feature_name="NGX_HAVE_C99_VARIADIC_MACROS"
-        ngx_feature_run=yes
+        ngx_feature_run=no
         ngx_feature_incs="#include <stdio.h>
 #define var(dummy, ...)  sprintf(__VA_ARGS__)"
         ngx_feature_path=
@@ -169,7 +169,7 @@ if [ "$NGX_PLATFORM" != win32 ]; then
 
     ngx_feature="gcc variadic macros"
     ngx_feature_name="NGX_HAVE_GCC_VARIADIC_MACROS"
-    ngx_feature_run=yes
+    ngx_feature_run=no
     ngx_feature_incs="#include <stdio.h>
 #define var(dummy, args...)  sprintf(args)"
     ngx_feature_path=
--- a/auto/os/linux
+++ b/auto/os/linux
@@ -48,7 +48,7 @@ fi
 
 ngx_feature="epoll"
 ngx_feature_name="NGX_HAVE_EPOLL"
-ngx_feature_run=yes
+ngx_feature_run=no
 ngx_feature_incs="#include <sys/epoll.h>"
 ngx_feature_path=
 ngx_feature_libs=
@@ -73,7 +73,7 @@ fi
 CC_AUX_FLAGS="$cc_aux_flags -D_GNU_SOURCE"
 ngx_feature="sendfile()"
 ngx_feature_name="NGX_HAVE_SENDFILE"
-ngx_feature_run=yes
+ngx_feature_run=no
 ngx_feature_incs="#include <sys/sendfile.h>
                   #include <errno.h>"
 ngx_feature_path=
@@ -94,7 +94,7 @@ fi
 CC_AUX_FLAGS="$cc_aux_flags -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64"
 ngx_feature="sendfile64()"
 ngx_feature_name="NGX_HAVE_SENDFILE64"
-ngx_feature_run=yes
+ngx_feature_run=no
 ngx_feature_incs="#include <sys/sendfile.h>
                   #include <errno.h>"
 ngx_feature_path=
@@ -112,7 +112,7 @@ ngx_include="sys/prctl.h"; . auto/includ
 
 ngx_feature="prctl(PR_SET_DUMPABLE)"
 ngx_feature_name="NGX_HAVE_PR_SET_DUMPABLE"
-ngx_feature_run=yes
+ngx_feature_run=no
 ngx_feature_incs="#include <sys/prctl.h>"
 ngx_feature_path=
 ngx_feature_libs=
--- a/auto/unix
+++ b/auto/unix
@@ -618,7 +618,7 @@ ngx_feature_test="void *p; p = memalign(
 
 ngx_feature="mmap(MAP_ANON|MAP_SHARED)"
 ngx_feature_name="NGX_HAVE_MAP_ANON"
-ngx_feature_run=yes
+ngx_feature_run=no
 ngx_feature_incs="#include <sys/mman.h>"
 ngx_feature_path=
 ngx_feature_libs=
@@ -631,7 +631,7 @@ ngx_feature_test="void *p;
 
 ngx_feature='mmap("/dev/zero", MAP_SHARED)'
 ngx_feature_name="NGX_HAVE_MAP_DEVZERO"
-ngx_feature_run=yes
+ngx_feature_run=no
 ngx_feature_incs="#include <sys/mman.h>
                   #include <sys/stat.h>
                   #include <fcntl.h>"
@@ -646,7 +646,7 @@ ngx_feature_test='void *p; int  fd;
 
 ngx_feature="System V shared memory"
 ngx_feature_name="NGX_HAVE_SYSVSHM"
-ngx_feature_run=yes
+ngx_feature_run=no
 ngx_feature_incs="#include <sys/ipc.h>
                   #include <sys/shm.h>"
 ngx_feature_path=
@@ -660,7 +660,7 @@ ngx_feature_test="int  id;
 
 ngx_feature="POSIX semaphores"
 ngx_feature_name="NGX_HAVE_POSIX_SEM"
-ngx_feature_run=yes
+ngx_feature_run=no
 ngx_feature_incs="#include <semaphore.h>"
 ngx_feature_path=
 ngx_feature_libs=