We installed tclCurl onto our 5.3 engine with some help from Quovadx. There were a couple of files that had to be copied out elsewhere to make it work…
If you can find the extra files, try copying them as directed.
$ cd TclCurl0.15.1
$ ls
README libTclCurl0.15.1.so pkgIndex.tcl
curl libcurl.a tclcurl.tcl
curl-config libcurl.la
$ less README
This version of TclCurl has been compiled on AIX 5.0 (riscy)
The tar file should be extracted in $HCIROOT/tcl/lib
the 2 libcurl files sould be copied to /usr/local/lib as root and be executable
the 2 files curl and curl-config should be copied to /usr/bin and be executable
Good luck….pete