Is there an error when installing apr in centOS 6.5 virtual machine?

This is the message from ./configure, what is going on

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This is the message from ./configure, what is going on

yum install libtool
less dependencies

I solved it myself:
In configure, RM='$RM -f' There must be a space after $RM here. If there is no space after it, just connect the minus sign directly and just follow

Of course an error will be reported. Change RM='$RM' to RM='$RM -f'