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-rw-r--r--INSTALL4
1 files changed, 4 insertions, 0 deletions
diff --git a/INSTALL b/INSTALL
index b819bb4b..1306f372 100644
--- a/INSTALL
+++ b/INSTALL
@@ -5,6 +5,10 @@ are C and C++ compilers: C for the gpsd daemon itself and its client C
library, C++ for the C++ client-library wrapper. You will also
need autotools; automake 1.10 or later and autoconf 2.61 or later
+The code depends on one non-C99 feature: anonymous unions. We could
+eliminate these, but the cost would be source-level interface breakage
+if we have to move structure members in and out of unions.
+
Having the following optional components on your system will enable
various additional capabilities and extensions: