/usr/bin/ld: ext/ldap/.libs/ldap.o: undefined reference to symbol ‘ber_strdup’
/usr/bin/ld:note: ‘ber_strdup’ is defined in DSO /lib64/liblber-2.4.so.2 so try adding it to the linker command line
/lib64/liblber-2.4.so.2:could not read symbols: Invalid operation
collect2:error: ld returned 1 exit status
make: *** [sapi/cli/php] Error 1
在PHP源码目录下 vi Makefile 找到 EXTRA_LIBS 行，在行末添加 ‘ -llber ‘ 保存退出再次make即可
php7 编译 collect2: error: ld returned 1 exit status
原文：http://my.oschina.net/coolmoo/blog/466128