"rpcgen: Command not found" When asyn

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Hi all,

    I use centos 8(64), base7.0.6.1,asyn from the github( https://github.com/epics-modules  )

    When I make tha asyn module, I met the question.

make[2]: Entering directory '/home/liangyx/synApps/support/asyn-master/asyn/O.linux-x86_64'
cp ../vxi11/vxi11intr.rpcl .
rpcgen  vxi11intr.rpcl
make[2]: rpcgen: Command not found
cp ../vxi11/vxi11core.rpcl .
rpcgen  vxi11core.rpcl
make[2]: rpcgen: Command not found
make[2]: *** No rule to make target 'vxi11core_xdr.c', needed by 'vxi11core_xdr.o'.  Stop.
make[2]: Leaving directory '/home/liangyx/synApps/support/asyn-master/asyn/O.linux-x86_64'
make[1]: *** [/home/liangyx/base-7.0.6.1/configure/RULES_ARCHS:58: install.linux-x86_64] Error 2
make[1]: Leaving directory '/home/liangyx/synApps/support/asyn-master/asyn'
make: *** [/home/liangyx/base-7.0.6.1/configure/RULES_DIRS:85: asyn.install] Error 2

I have tried "yum install glibc-utils and yum install glibc."       Neither worked.

How I could fix it?

Thanks

Liang