Need to create %_bindir first

bisq-exchange.spec.in

@@ -29,7 +29,7 @@ The decentralized bitcoin exchange https://bisq.network
     } > bisq-exchange
 
 %install
-    mkdir -p "%{buildroot}/opt/bisq-exchange"
+    mkdir -p "%{buildroot}/opt/bisq-exchange" "%{buildroot}%{_bindir}"
     cp -r ./[a-z0-9]* "%{buildroot}/opt/bisq-exchange"
     install -m 0755 bisq-exchange "%{buildroot}/opt/bisq-exchange"
     ln -sT "/opt/bisq-exchange/bisq-exchange" "%{buildroot}${_bindir}/bisq-exchange"