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construct/doc/BUILD.md

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## Installation Addendum
#### Additional build options
Development builds should follow the same instructions as the standalone
section above while taking note of the following `./configure` options:
##### Debug mode
```
--enable-debug
```
Full debug mode. Includes additional code within `#ifdef RB_DEBUG` sections.
Optimization level is `-Og`, which is still valgrind-worthy. Debugger support
is `-ggdb`. Log level is `DEBUG` (maximum). Assertions are enabled.
##### Release modes (for distribution packages)
Options in this section may help distribution maintainers create packages.
Users building for themselves (whether standalone or fully installed) probably
don't need anything here.
```
--enable-generic
```
Sets `-mtune=generic` as `native` is otherwise the default.
##### Manually enable assertions
```
--enable-assert
```
Implied by `--enable-debug`. This is useful to specifically enable `assert()`
statements when `--enable-debug` is not used.
##### Manually enable optimization
```
--enable-optimize
```
This manually applies full release-mode optimizations even when using
`--enable-debug`. Implied when not in debug mode.
##### Logging level
```
--with-log-level=
```
This manually sets the level of logging. All log levels at or below this level
will be available. When a log level is not available, all code used to generate
its messages will be entirely eliminated via *dead-code-elimination* at compile
time.
The log levels are (from logger.h):
```
7 DEBUG Maximum verbosity for developers.
6 DWARNING A warning but only for developers (more frequent than WARNING).
5 DERROR An error but only worthy of developers (more frequent than ERROR).
4 INFO A more frequent message with good news.
3 NOTICE An infrequent important message with neutral or positive news.
2 WARNING Non-impacting undesirable behavior user should know about.
1 ERROR Things that shouldn't happen; user impacted and should know.
0 CRITICAL Catastrophic/unrecoverable; program is in a compromised state.
```
When `--enable-debug` is used `--with-log-level=DEBUG` is implied. Otherwise
for release mode `--with-log-level=INFO` is implied. Large deployments with
many users may consider lower than `INFO` to maximize optimization and reduce
noise.