pg 10.1 missing libpq in postgresql-devel

[support-tiger]

running postgresql 10.1 on Fedora 27.  Cannot install ruby pg gem due to 
missing libpq-fe.h file.  This is usually found in postgresql-devel but 
it is not in fedora 27 postgresql10-devel. If install postgresql-devel 
(9.6) the gem installs without problem but afraid this will interfere 
with 10.1  How can we install the necessary libpq-fe.h  ?  thks

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