#3508 configure is incomplete

[Felix]

First, on a system without g++, I get

$ ../configure
[..]
checking for treedec/combinations.hpp... no
configure: treedec library missing, falling back to Thorup.
checking for gala/graph.h... no
checking for boost/graph/adjacency_list.hpp... no
configure: error: boost library not found (boost/graph/adjacency_list.hpp).

config.log reveals that the error is misleading
[..]
configure:5777: result: no
configure:5786: checking for boost/graph/adjacency_list.hpp
configure:5786: g++ -c conftest.cpp >&5
../configure: line 1728: g++: command not found
configure:5786: $? = 127

Perhaps configure should report the missing C++ compiler instead.

Second, during compilation on a system withuot libz-dev, I get
./../../../support/sdbinutils/bfd/compress.c:22:10: fatal error: zlib.h: No such file or directory
22 | #include <zlib.h></zlib.h>

Perhaps configure should report missing zlib instead.

[Tom Li]

Can confirm. The project needs zlib but the configure script does not check it, making it possible for the build to fail half way.

[Philipp Klaus Krause]

Fixed in [r14532] via the change proposed by Steve Schnepp in [bugs:#3671].