dependency requirements

INSTALL.md

@@ -3,6 +3,8 @@
 
 ### Configure
 
+See [REQUIREMENTS.md](REQUIREMENTS.md) for the complete list of dependencies.
+
 Configure with the default settings:
 
     test -f configure || autoreconf -iv

Makefile.am

@@ -12,6 +12,6 @@ SUBDIRS = 				\
 
 docsdir = $(datadir)/doc/asn1c
 
-docs_DATA = README.md INSTALL.md FAQ ChangeLog BUGS TODO
+docs_DATA = README.md INSTALL.md REQUIREMENTS.md FAQ ChangeLog BUGS TODO
 
-EXTRA_DIST = README.md INSTALL.md FAQ LICENSE BUGS
+EXTRA_DIST = README.md INSTALL.md REQUIREMENTS.md FAQ LICENSE BUGS

REQUIREMENTS.md

+
+## To compile asn1c compiler itself
+
+Compiler:
+
+A working C99 compiler or better, such as gcc-4.x or clang-3.4.
+
+### Packages
+
+This notation specifies a minimum required package version (-ver)
+or an exact version (=ver). For example, bison=2.x requires the 2.x branch
+of bison, not 3.x.
+
+ * automake-1.15
+ * libtool
+ * bison=2.x
+ * flex
+
+## To compile asn1c-generated code
+
+C:
+As a minimum, a compiler supporting the C90. Pretty much any modern C compiler
+will do, but gcc or clang is recommended. Note that MSVC++ is not a C compiler.
+
+C++:
+A C++11 compliant compiler is recommended.
+