记录一次编译错误：platform_version.mk:161: *** Must build against Android ＞= 5.1. Stop

 make[1]: Entering directory `/home/liping/yandex_old/kernel/system/lib/develop/3d_graphic_android_1.7_RTM_4332920/rogue_km/build/linux/rtkge7800_android' 
 ../common/android/platform_version.mk:161: *** Must build against Android >= 5.1.  Stop. 
 make[1]: Leaving directory `/home/liping/yandex_old/kernel/system/lib/develop/3d_graphic_android_1.7_RTM_4332920/rogue_km/build/linux/rtkge7800_android' 
 android dir: nougat 
 arm 32 mode 
 TARGET_PRODUCT=RealtekATV 
 TARGET_DEVICE=RealtekATV 
 chain \n 
 toolchain path: 
 /bin/sh: line 0: test: -gt: unary operator expected 
 /bin/sh: line 0: test: -eq: unary operator expected 
 /bin/sh: line 0: test: -ge: unary operator expected 
 /bin/sh: line 0: test: -ge: unary operator expected 
 /bin/sh: line 0: test: -gt: unary operator expected 
 /bin/sh: line 0: test: -eq: unary operator expected 
 make[1]: Entering directory `/home/liping/yandex_old/kernel/system/lib/develop/3d_graphic_android_1.7_RTM_4332920/rogue_km/build/linux/rtkge7800_android' 
 ../common/android/platform_version.mk:161: *** Must build against Android >= 5.1.  Stop. 
 make[1]: Leaving directory `/home/liping/yandex_old/kernel/system/lib/develop/3d_graphic_android_1.7_RTM_4332920/rogue_km/build/linux/rtkge7800_android' 
 /bin/sh: line 0: cd: ../../../binary_rtkge7800_android_release/target_armv7-a: No such file or directory 
 make: *** [all] Error 1 
 make: Leaving directory `/home/liping/yandex_old/kernel/system'

 找到文件build/tool/buildinfo.sh
 删除行“echo "ro.build.version.release=`svn info | grep Revision | awk '{print $2}'`"”