buildroot构建根文件系统报错(set FORCE_UNSAFE_CONFIGURE=1)

错误1 set FORCE_UNSAFE_CONFIGURE=1

在使用buildroot构建根文件系统时，一切按照文档的配置，但是在make的时候出现：

checking whether mknod can create fifo without root privileges... configure: error: in `/home/xxx/buildroot-2025.02/output/build/host-tar-1.35':
configure: error: you should not run configure as root (set FORCE_UNSAFE_CONFIGURE=1 in environment to bypass this check)
See `config.log' for more details
package/pkg-generic.mk:253: recipe for target '/home/xxx/buildroot-2025.02/output/build/host-tar-1.35/.stamp_configured' failed
make: *** [/home/xxx/buildroot-2025.02/output/build/host-tar-1.35/.stamp_configured] Error 1

错误2 expected 4.1.x, got 4.0.x

解决错误1之后，出现下面问题：

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3

Incorrect selection of kernel headers: expected 4.1.x, got 4.0.x
package/pkg-generic.mk:253: recipe for target '/home/xxxbuildroot-2025.02/output/build/toolchain-external-custom/.stamp_configured' failed
make: *** [/home/xxx/buildroot-2025.02/output/build/toolchain-external-custom/.stamp_configured] Error 1

错误3 toolchain-external-custom/.stamp_configured failed

解决问题2后，编译过程出现以下问题：

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Fortran support is not selected but is available in external toolchain
package/pkg-generic.mk:253: recipe for target '/home/xxx/buildroot-2025.02/output/build/toolchain-external-custom/.stamp_configured' failed
make: *** [/home/xxx/buildroot-2025.02/output/build/toolchain-external-custom/.stamp_configured] Error 1

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3

OpenMP support is not selected but is available in external toolchain
package/pkg-generic.mk:253: recipe for target '/home/zwl/linux/IMX6ULL/buildroot-2025.02/output/build/toolchain-external-custom/.stamp_configured' failed
make: *** [/home/zwl/linux/IMX6ULL/buildroot-2025.02/output/build/toolchain-external-custom/.stamp_configured] Error 1

错误4 fatal error: sys/random.h: No such file or directory

解决以上问题后，又又又出现下面问题：

ubi-utils/ubihealthd.c:15:24: fatal error: sys/random.h: No such file or directory
compilation terminated.
Makefile:3020: recipe for target 'ubi-utils/ubihealthd.o' failed
make[1]: *** [ubi-utils/ubihealthd.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make[1]: Leaving directory '/home/zwl/linux/IMX6ULL/buildroot-2025.02/output/build/host-mtd-2.2.1'
package/pkg-generic.mk:270: recipe for target '/home/zwl/linux/IMX6ULL/buildroot-2025.02/output/build/host-mtd-2.2.1/.stamp_built' failed
make: *** [/home/zwl/linux/IMX6ULL/buildroot-2025.02/output/build/host-mtd-2.2.1/.stamp_built] Error 2

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ERROR: No hash found for busybox-1.29.3.tar.bz2
package/pkg-generic.mk:175: recipe for target '/home/zwl/linux/IMX6ULL/buildroot-2025.02/output/build/busybox-1.29.3/.stamp_downloaded' failed
make: *** [/home/zwl/linux/IMX6ULL/buildroot-2025.02/output/build/busybox-1.29.3/.stamp_downloaded] Error 1

解决方法

可以看到，报错里面让我们set FORCE_UNSAFE_CONFIGURE=1 in environment to bypass this check。

首先切换管理员用户
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sudo su root
然后输入
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export FORCE_UNSAFE_CONFIGURE=1
最后重新构建。
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make

对于问题2

expected 4.1.x, got 4.0.x，意思是我们在配置buildroot的Toolchain时，选择的内核头为4.1.x，而交叉编译器里的内核头为4.0.x。我们打开交叉编译器的version.h文件
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sudo vim /usr/local/arm/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf/arm-linux-gnueabihf/libc/usr/include/linux/version.h
可以看到，LINUX_VERSION_CODE 262144，此值为10进制，转换为16进制为40000，对应的linux内核版本为4.0.x

我们将buildroot的Toolchain里面的External toolchain kernel headers series改为4.0.x,然后最好清理一下
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make clean
然后重新编译：
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make

对于问题三，很明显，提示也给出了原因

进入配置界面在Toolchain交叉编译工具下输入y使能Fortran和OpenMP。

针对问题四，较老版本的Linux 是没有 sys/random.h 文件的，所以我们需要修改下载的busybox版本

进入busybox目录下：
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/home/xxx/buildroot-2025.02/package/busybox
修改BUSYBOX_VERSION 为1.29.3.然后终端输入
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make busybox-dirclean
make
编译后，出现缺少Hash，添加Hash后，又会出现 Buildroot 正在尝试对 busybox-1.33.2 的源码打补丁时，找不到要打补丁的文件，所以补丁失败，最终构建失败。

改到这博主又去把这些补丁删除，不让Buildroot打补丁，但是后续编译就会出错。

所以只能删掉现在的buildroot，换成低版本。换成低版本后，没有报错，直接可以编译成功，所以按照手册来才是最优解，不然折腾太磨人了。