代码拷贝后编译出现CDPATH=“${ZSH_VERSION+.}:“ && cd .. && /bin/bash ..../missing aclocal-1.14 -I m4/config 报错

背景

最近拿一份祖传的strongswan代码在改，本来已经测试通过了，结果拷贝了一份再make就提示

make[2]: 进入目录“/root/fsm_build/LINUX/target/nxp-lsdk-external-noship/flexbuild_lsdk2004/packages/apps/security/strongswan/build”
CDPATH="${ZSH_VERSION+.}:" && cd .. && /bin/bash /root/fsm_build/LINUX/target/nxp-lsdk-external-noship/flexbuild_lsdk2004/packages/apps/security/strongswan/missing aclocal-1.14 -I m4/config
 cd .. && /bin/bash /root/fsm_build/LINUX/target/nxp-lsdk-external-noship/flexbuild_lsdk2004/packages/apps/security/strongswan/missing automake-1.14 --gnu
CDPATH="${ZSH_VERSION+.}:" && cd .. && /bin/bash /root/fsm_build/LINUX/target/nxp-lsdk-external-noship/flexbuild_lsdk2004/packages/apps/security/strongswan/missing autoconf
configure.ac:344: error: possibly undefined macro: AC_LIB_PREFIX
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
Makefile:506: recipe for target '../configure' failed
make[2]: *** [../configure] Error 1
make[2]: 离开目录“/root/fsm_build/LINUX/target/nxp-lsdk-external-noship/flexbuild_lsdk2004/packages/apps/security/strongswan/build”
/root/fsm_build/LINUX/target/nxp-lsdk-external-noship/flexbuild_lsdk2004/packages/apps/security/security.mk:195: recipe for target 'strongswan' failed
make[1]: *** [strongswan] Error 2
make[1]: 离开目录“/root/fsm_build/LINUX/target/nxp-lsdk-external-noship/flexbuild_lsdk2004/packages/apps”
Makefile:25: recipe for target 'strongswan' failed
make: *** [strongswan] Error 2

头大，原来编的好好的，没出现过这种问题呀

问题原因

原因是我是通过cp -r 复制的源码（git pull 同理），这就导致文件的创建时间发生了变化，大家都知道makefile是通过依赖文件的更改时间来自动推导目标文件是否要重新编译的，于是我的makefile就开始重新生成makefile.in了，然后我当前环境的automake还有问题，于是提示error: possibly undefined macro: AC_LIB_PREFIX。
附一份主makefile中关于makefile.in推导逻辑，大家有能力可以研究研究，我是没看懂

.SUFFIXES:
am--refresh: Makefile
	@:
$(srcdir)/Makefile.in:  $(srcdir)/Makefile.am  $(am__configure_deps)
	@for dep in $?; do \
	  case '$(am__configure_deps)' in \
	    *$$dep*) \
	      echo ' cd $(srcdir) && $(AUTOMAKE) --gnu'; \
	      $(am__cd) $(srcdir) && $(AUTOMAKE) --gnu \
		&& exit 0; \
	      exit 1;; \
	  esac; \
	done; \
	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu Makefile'; \
	$(am__cd) $(top_srcdir) && \
	  $(AUTOMAKE) --gnu Makefile
.PRECIOUS: Makefile
Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
	@case '$?' in \
	  *config.status*) \
	    echo ' $(SHELL) ./config.status'; \
	    $(SHELL) ./config.status;; \
	  *) \
	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $@ $(am__depfiles_maybe)'; \
	    cd $(top_builddir) && $(SHELL) ./config.status $@ $(am__depfiles_maybe);; \
	esac;

$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
	$(SHELL) ./config.status --recheck

$(top_srcdir)/configure:  $(am__configure_deps)
	$(am__cd) $(srcdir) && $(AUTOCONF)
$(ACLOCAL_M4):  $(am__aclocal_m4_deps)
	$(am__cd) $(srcdir) && $(ACLOCAL) $(ACLOCAL_AMFLAGS)
$(am__aclocal_m4_deps):

解决方法

解决方法有两个：
一是复制时复制时间戳属性，通过cp -ar ，rsync -av ，tar打包这些命令都可。
二是解决 error: possibly undefined macro: AC_LIB_PREFIX报错，我是将环境升级为automake-1.15后解决的