configure: error: *** POSIX caps library not found

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在交叉编译systemd的时候，遇到上面的报错。

步骤是这样的：

export CFLAGS="-I/home/charles/code/build_systemd/libcap2-2.24/libcap/include"

export LDFLAGS="-L/home/charles/code/build_systemd/libcap2-2.24/libcap"

./configure --host=arm-linux-gnueabi

错误如下：

checking for linux/vm_sockets.h... yeschecking for library containing clock_gettime... none requiredchecking for library containing cap_init... noconfigure: error: *** POSIX caps library not found

可是，caps 库文件是存在的：

$ ls /home/charles/code/build_systemd/libcap2-2.24/libcap/libcap.*/home/charles/code/build_systemd/libcap2-2.24/libcap/libcap.a/home/charles/code/build_systemd/libcap2-2.24/libcap/libcap.h/home/charles/code/build_systemd/libcap2-2.24/libcap/libcap.pc/home/charles/code/build_systemd/libcap2-2.24/libcap/libcap.pc.in/home/charles/code/build_systemd/libcap2-2.24/libcap/libcap.so/home/charles/code/build_systemd/libcap2-2.24/libcap/libcap.so.2/home/charles/code/build_systemd/libcap2-2.24/libcap/libcap.so.2.24

看一下 config.log，里面有这样的错误：

configure:16647: arm-linux-gnueabi-gcc -o conftest -I/home/charles/code/build_systemd/libcap2-2.24/libcap/include  -L/home/charles/code/build_systemd/libcap2-2.24/libcap conftest.c -lcap   >&5/toolchain/armv7-gcc-6.3/bin/../lib/gcc/arm-linux-gnueabi/6.3.0/../../../../arm-linux-gnueabi/bin/ld: warning: libattr.so.1, needed by /home/charles/code/build_systemd/libcap2-2.24/libcap/libcap.so, not found (try using -rpath or -rpath-link)/home/charles/code/build_systemd/libcap2-2.24/libcap/libcap.so: undefined reference to `removexattr@ATTR_1.0'/home/charles/code/build_systemd/libcap2-2.24/libcap/libcap.so: undefined reference to `fremovexattr@ATTR_1.0'/home/charles/code/build_systemd/libcap2-2.24/libcap/libcap.so: undefined reference to `getxattr@ATTR_1.0'/home/charles/code/build_systemd/libcap2-2.24/libcap/libcap.so: undefined reference to `setxattr@ATTR_1.0'/home/charles/code/build_systemd/libcap2-2.24/libcap/libcap.so: undefined reference to `fsetxattr@ATTR_1.0'/home/charles/code/build_systemd/libcap2-2.24/libcap/libcap.so: undefined reference to `fgetxattr@ATTR_1.0'collect2: error: ld returned 1 exit statusconfigure:16647: $? = 1configure: failed program was:| /* confdefs.h */| #define PACKAGE_NAME "systemd"| #define PACKAGE_TARNAME "systemd"| #define PACKAGE_VERSION "233"| #define PACKAGE_STRING "systemd 233"| #define PACKAGE_BUGREPORT "https://github.com/systemd/systemd/issues"| #define PACKAGE_URL "https://www.freedesktop.org/wiki/Software/systemd"| #define STDC_HEADERS 1| #define HAVE_SYS_TYPES_H 1| #define HAVE_SYS_STAT_H 1| #define HAVE_STDLIB_H 1| #define HAVE_STRING_H 1| #define HAVE_MEMORY_H 1| #define HAVE_STRINGS_H 1| #define HAVE_INTTYPES_H 1| #define HAVE_STDINT_H 1| #define HAVE_UNISTD_H 1| #define __EXTENSIONS__ 1| #define _ALL_SOURCE 1| #define SIZEOF_DEV_T 8| #define SIZEOF_INO_T 8| #define SIZEOF_RLIM_T 8| #define GPERF_LEN_TYPE size_t| #define HAVE_SYS_CAPABILITY_H 1| #define HAVE_LINUX_BTRFS_H 1| #define HAVE_LINUX_MEMFD_H 1| #define HAVE_LINUX_VM_SOCKETS_H 1| /* end confdefs.h.  */|| /* Override any GCC internal prototype to avoid an error.|    Use char because int might match the return type of a GCC|    builtin and then its argument prototype would still apply.  */| #ifdef __cplusplus| extern "C"| #endif| char cap_init ();| int| main ()| {| return cap_init ();|   ;|   return 0;| }configure:16664: result: noconfigure:16671: error: *** POSIX caps library not found

原来，错误的原因是没有加上 -lattr.

修改如下：

export LDFLAGS="-L/home/charles/code/build_systemd/libcap2-2.24/libcap -L/home/charles/code/build_systemd/attr-2.4.47/libattr/.libs -lattr"

重新执行 configure,通过了。

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