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我的程序包括两个外部库的头文件：nifti_io.h和CImg.h（分别从此处和此处下载）。编译器（Code::Blocks 中的 GCC 8.2.0）返回了这些奇怪的错误/usr/include/dirent.h- IDE 中的构建消息是：

g++ -Wall -fexceptions -O2 -c /tmp/image_test.cpp -o tmp/obj/Release/image_test.o
g++ -o bin/Release/image_test obj/Release/image_test.o -s ../z/libz.so ../znz/bin/Release/libznz.so ../nifti/bin/Release/libnifti.so
In file included from /usr/include/nifti/nifti1_io.h:18,
             from /tmp/image_test.cpp:4:
/usr/include/dirent.h:99:5: error: expected identifier before numeric constant
     DT_UNKNOWN = 0,
     ^~~~~~~~~~
/usr/include/dirent.h:99:5: error: expected ‘}’ before numeric constant
In file included from /tmp/CImg.h:173,
             from /tmp/image_test.cpp:7:
/usr/include/dirent.h:98:3: note: to match this ‘{’
   {
   ^
In file included from /usr/include/nifti/nifti1_io.h:18,
             from /tmp/image_test.cpp:4:
/usr/include/dirent.h:99:5: error: expected unqualified-id before numeric constant
     DT_UNKNOWN = 0,
     ^~~~~~~~~~
In file included from /usr/include/features.h:424,
             from /usr/include/x86_64-linux-gnu/bits/libc-header-start.h:33,
             from /usr/include/stdio.h:27,
             from /usr/include/nifti/nifti1_io.h:9,
             from /tmp/image_test.cpp:4:
/usr/include/dirent.h:402:1: error: expected declaration before ‘}’ token
 __END_DECLS
 ^~~~~~~~~~~
Process terminated with status 1 (0 minute(s), 0 second(s))
4 error(s), 0 warning(s) (0 minute(s), 0 second(s))

在从字面上注释掉所有内容之后（包括这些库之后的所有程序都是int main() { return (0); }），错误仍然存​​在。

#include "nifti/nifti1_io.h"
#include "CImg.h"
int main() { return ( 0 ); }

仅包括其中一个（或nifti1_io.h或CImg.h）编译时不会出现错误或警告。包括他们两个返回上面的输出。

有谁知道是什么原因造成的以及如何解决它？我的猜测是它与编译器指令有关，特别是那些涉及extern "C". 我想保持包含的头文件完整，因为它们不是我的。

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