osx man page for tcl_getversion

Tcl_GetVersion(3)					      Tcl Library Procedures						 Tcl_GetVersion(3)

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NAME
       Tcl_GetVersion - get the version of the library at runtime

SYNOPSIS
       #include <tcl.h>

       Tcl_GetVersion(major, minor, patchLevel, type)

ARGUMENTS
       int *major (out) 			 Major version number of the Tcl library.

       int *minor (out) 			 Minor version number of the Tcl library.

       int *patchLevel (out)			 The patch level of the Tcl library (or alpha or beta number).

       Tcl_ReleaseType *type (out)		 The  type  of	release,  also indicates the type of patch level. Can be one of TCL_ALPHA_RELEASE,
						 TCL_BETA_RELEASE, or TCL_FINAL_RELEASE.
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DESCRIPTION
       Tcl_GetVersion should be used to query the version number of the Tcl library at runtime.  This is useful when using  a  dynamically  loaded
       Tcl library or when writing a stubs-aware extension.  For instance, if you write an extension that is linked against the Tcl stubs library,
       it could be loaded into a program linked to an older version of Tcl than you expected.  Use Tcl_GetVersion to verify that fact, and  possi-
       bly to change the behavior of your extension.

       Tcl_GetVersion  accepts NULL for any of the arguments. For instance if you do not care about the patchLevel of the library, pass a NULL for
       the patchLevel argument.

KEYWORDS
       version, patchlevel, major, minor, alpha, beta, release

Tcl									7.5							 Tcl_GetVersion(3)