The compiler under Linux cannot find the header file

The problem arises:

If the header file cannot be found when compiling the program on Linux, the following error will be prompted:

$ gcc test.c -o test
test.c:9:16: fatal error: xxx.h: No such file or directory
 #include<xxx.h>

The following description takes the Ubuntu system as an example.

(Free video tutorial sharing: linux video tutorial)

The solution is as follows:

1. First find the path where xxx.h is located

The command is as follows:

$ sudo find / -name xxx.h

The result is as follows:

/usr/local/include/xxx/xxx.h

2. Then use the -I option to add the directory to compile

The command is as follows:

$ gcc test.c -o test -I /usr/local/include/xxx

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