This variable is added [1] with the assumption that on a sane system,
fopen(<dir>, "r") should return NULL. Linux and FreeBSD do not meet this
expectation while at least Windows and AIX do. Let's make sure they
behave the same way.

I only tested one version on Linux (4.7.0 with glibc 2.22) and
FreeBSD (11.0) but since GNU/kFreeBSD is fbsd kernel with gnu userspace,
I'm pretty sure it shares the same problem.

[1] cba22528fa (Add compat/fopen.c which returns NULL on attempt to open
    directory - 2008-02-08)

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 config.mak.uname | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/config.mak.uname b/config.mak.uname
index 399fe19271..a25ffddb3e 100644
--- a/config.mak.uname
+++ b/config.mak.uname
@@ -36,6 +36,7 @@ ifeq ($(uname_S),Linux)
        NEEDS_LIBRT = YesPlease
        HAVE_GETDELIM = YesPlease
        SANE_TEXT_GREP=-a
+       FREAD_READS_DIRECTORIES = UnfortunatelyYes
 endif
 ifeq ($(uname_S),GNU/kFreeBSD)
        HAVE_ALLOCA_H = YesPlease
@@ -43,6 +44,7 @@ ifeq ($(uname_S),GNU/kFreeBSD)
        HAVE_PATHS_H = YesPlease
        DIR_HAS_BSD_GROUP_SEMANTICS = YesPlease
        LIBC_CONTAINS_LIBINTL = YesPlease
+       FREAD_READS_DIRECTORIES = UnfortunatelyYes
 endif
 ifeq ($(uname_S),UnixWare)
        CC = cc
@@ -201,6 +203,7 @@ ifeq ($(uname_S),FreeBSD)
        GMTIME_UNRELIABLE_ERRORS = UnfortunatelyYes
        HAVE_BSD_SYSCTL = YesPlease
        PAGER_ENV = LESS=FRX LV=-c MORE=FRX
+       FREAD_READS_DIRECTORIES = UnfortunatelyYes
 endif
 ifeq ($(uname_S),OpenBSD)
        NO_STRCASESTR = YesPlease
-- 
2.11.0.157.gd943d85

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