version problem of libosmocore during installing osmoTRX

$ git clone git：//git.osmocom.org/osmo-trx $ git branch * master $ ./configure ... checking for LIBOSMOCORE... no configure: error: Package requirements (libosmocore >= 1.3.0) were not met: No package 'libosmocore' found Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix. Then, check the information of libosmocore: $dpkg -l |grep libosmocore ii libosmocore:amd64 0.9.0-7 amd64 Open Source MObile COMmunications CORE library (metapackage) ii libosmocore6:amd64 0.9.0-7 amd64 Osmo Core library $ sudo apt-get install libosmocore ... libosmocore has already been the newest version (0.9.0-7)。 why???what can i do?