bitcoin-abc: ./amount.h:76:63: error: can't initialize friend function 'operator*'

I’m trying to build the client with the latest github checkout, using the following commands:

./autogen.sh
./configure --enable-cxx --disable-shared --with-pic --prefix=/opt/bitcoin-cash-build PKG_CONFIG_PATH=/opt/openssl/lib/pkgconfig LIBS=-Wl,-rpath,/opt/openssl/lib
make

The result of make is:

Making all in src
make[1]: Entering directory `/opt/bitcoin-cash/src'
make[2]: Entering directory `/opt/bitcoin-cash/src'
  CXX      consensus/libbitcoinconsensus_la-merkle.lo
In file included from ./primitives/transaction.h:9:0,
                 from ./primitives/block.h:9,
                 from consensus/merkle.h:11,
                 from consensus/merkle.cpp:5:
./amount.h:76:63: error: can't initialize friend function 'operator*'
     friend Amount operator*(const double a, const Amount b) = delete;
                                                               ^
make[2]: *** [consensus/libbitcoinconsensus_la-merkle.lo] Error 1
make[2]: Leaving directory `/opt/bitcoin-cash/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/opt/bitcoin-cash/src'
make: *** [all-recursive] Error 1

This is on OEL. I previously did this without issue at the time of the fork using the same process.

I have no local changes (this is a fresh clone).

I’m afraid I’m not familiar with the code, so I may have overlooked something obvious.