Using the libreOffice sdk from package libreoffice-dev I'm getting
➜ sdk /usr/lib/libreoffice/sdk/bin/idlc -C -O /home/lucas/dev/clojurecalc/ClojureCalc/build/idl/urd -I /home/lucas/dev/clojurecalc/ClojureCalc/src -I /usr/lib/libreoffice/sdk/idl /home/lucas/dev/clojurecalc/ClojureCalc/src/com/github/beothorn/clojurecalc/ClojureCalc.idl
Compiling: /home/lucas/dev/clojurecalc/ClojureCalc/src/com/github/beothorn/clojurecalc/ClojureCalc.idl
:1 [62:62] : Statement can not be parsed: syntax error, unexpected $undefined
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:80 [42:42] : Statement can not be parsed: definitions
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:94 [5:8] : Statement can not be parsed: syntax error, unexpected IDL_VOID
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:94 [19:19] : Statement can not be parsed: definitions
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:100 [5:8] : Statement can not be parsed: syntax error, unexpected IDL_VOID
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:100 [19:19] : Statement can not be parsed: definitions
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:102 [1:1] : Statement can not be parsed: syntax error, unexpected '}', expecting $end
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:102 [2:2] : Statement can not be parsed: definitions
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:105 [1:1] : Statement can not be parsed: syntax error, unexpected '}', expecting $end
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:105 [2:2] : Statement can not be parsed: definitions
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:105 [4:4] : Statement can not be parsed: syntax error, unexpected '}', expecting $end
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:105 [5:5] : Statement can not be parsed: definitions
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:105 [7:7] : Statement can not be parsed: syntax error, unexpected '}', expecting $end
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:105 [8:8] : Statement can not be parsed: definitions
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:105 [10:10] : Statement can not be parsed: syntax error, unexpected '}', expecting $end
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:105 [11:11] : Statement can not be parsed: definitions
Using the libreOffice sdk from package libreoffice-dev I'm getting
➜ sdk /usr/lib/libreoffice/sdk/bin/idlc -C -O /home/lucas/dev/clojurecalc/ClojureCalc/build/idl/urd -I /home/lucas/dev/clojurecalc/ClojureCalc/src -I /usr/lib/libreoffice/sdk/idl /home/lucas/dev/clojurecalc/ClojureCalc/src/com/github/beothorn/clojurecalc/ClojureCalc.idl
Compiling: /home/lucas/dev/clojurecalc/ClojureCalc/src/com/github/beothorn/clojurecalc/ClojureCalc.idl
:1 [62:62] : Statement can not be parsed: syntax error, unexpected $undefined
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:80 [42:42] : Statement can not be parsed: definitions
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:94 [5:8] : Statement can not be parsed: syntax error, unexpected IDL_VOID
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:94 [19:19] : Statement can not be parsed: definitions
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:100 [5:8] : Statement can not be parsed: syntax error, unexpected IDL_VOID
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:100 [19:19] : Statement can not be parsed: definitions
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:102 [1:1] : Statement can not be parsed: syntax error, unexpected '}', expecting $end
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:102 [2:2] : Statement can not be parsed: definitions
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:105 [1:1] : Statement can not be parsed: syntax error, unexpected '}', expecting $end
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:105 [2:2] : Statement can not be parsed: definitions
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:105 [4:4] : Statement can not be parsed: syntax error, unexpected '}', expecting $end
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:105 [5:5] : Statement can not be parsed: definitions
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:105 [7:7] : Statement can not be parsed: syntax error, unexpected '}', expecting $end
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:105 [8:8] : Statement can not be parsed: definitions
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:105 [10:10] : Statement can not be parsed: syntax error, unexpected '}', expecting $end
/usr/lib/libreoffice/sdk/idl/com/sun/star/uno/XInterface.idl:105 [11:11] : Statement can not be parsed: definitions