Document new flags for the build systems

README.md

@@ -344,6 +344,10 @@ Also needs a UTF8 locale and a font that covers:
 
    Append `STRIP=true` to force stripping of debug symbols (adds `-s` linker flag).
 
+   Append `ENABLE_SYSLOG=true` to log to syslog instead of a logfile.
+
+   Append `ENABLE_JOURNALD=true` to log to journald instead of a logfile.
+
    Append `ARCH=<architecture>` to manually set the target architecture.
    If omitted the makefile uses the machine triple (output of `-dumpmachine` compiler parameter) to detect the target system.
 
@@ -447,6 +451,8 @@ Also needs a UTF8 locale and a font that covers:
    | `-DBTOP_STATIC=<ON\|OFF>`       | Enables static linking (OFF by default)                                 |
    | `-DBTOP_LTO=<ON\|OFF>`          | Enables link time optimization (ON by default)                          |
    | `-DBTOP_USE_MOLD=<ON\|OFF>`     | Use mold to link btop (OFF by default)                                  |
+   | `-DBTOP_LOG_SYSLOG=<ON\|OFF>` | Log to syslog instead of a logfile (OFF by default)                       |
+   | `-DBTOP_LOG_JOURNALD=<ON\|OFF>` | Log to journald instead of a logfile (OFF by default)                   |
    | `-DBTOP_PEDANTIC=<ON\|OFF>`     | Compile with additional warnings (OFF by default)                       |
    | `-DBTOP_WERROR=<ON\|OFF>`       | Compile with warnings as errors (OFF by default)                        |
    | `-DCMAKE_INSTALL_PREFIX=<path>` | The installation prefix ('/usr/local' by default)                       |
@@ -509,6 +515,8 @@ Also needs a UTF8 locale and a font that covers:
 
    Append `STRIP=true` to force stripping of debug symbols (adds `-s` linker flag).
 
+   Append `ENABLE_SYSLOG=true` to log to syslog instead of a logfile.
+
    Append `ARCH=<architecture>` to manually set the target architecture.
    If omitted the makefile uses the machine triple (output of `-dumpmachine` compiler parameter) to detect the target system.
 
@@ -603,6 +611,8 @@ Also needs a UTF8 locale and a font that covers:
 
    Append `STRIP=true` to force stripping of debug symbols (adds `-s` linker flag).
 
+   Append `ENABLE_SYSLOG=true` to log to syslog instead of a logfile.
+
    Append `ARCH=<architecture>` to manually set the target architecture.
    If omitted the makefile uses the machine triple (output of `-dumpmachine` compiler parameter) to detect the target system.
 
@@ -719,6 +729,7 @@ Also needs a UTF8 locale and a font that covers:
    | `-DBTOP_STATIC=<ON\|OFF>`       | Enables static linking (OFF by default)                                 |
    | `-DBTOP_LTO=<ON\|OFF>`          | Enables link time optimization (ON by default)                          |
    | `-DBTOP_USE_MOLD=<ON\|OFF>`     | Use mold to link btop (OFF by default)                                  |
+   | `-DBTOP_LOG_SYSLOG=<ON\|OFF>`   | Log to syslog instead of a logfile (OFF by default)                     |
    | `-DBTOP_PEDANTIC=<ON\|OFF>`     | Compile with additional warnings (OFF by default)                       |
    | `-DBTOP_WERROR=<ON\|OFF>`       | Compile with warnings as errors (OFF by default)                        |
    | `-DCMAKE_INSTALL_PREFIX=<path>` | The installation prefix ('/usr/local' by default)                       |