diff --git a/archival/libunarchive/Kbuild b/archival/libunarchive/Kbuild
index 4e14541..010043c 100644
--- a/archival/libunarchive/Kbuild
+++ b/archival/libunarchive/Kbuild
@@ -26,7 +26,6 @@
 \
 	data_align.o \
 	find_list_entry.o \
-	open_transformer.o \
 	init_handle.o
 
 GUNZIP_FILES:= check_header_gzip.o decompress_unzip.o
@@ -36,6 +35,13 @@
 	get_header_tar.o \
 	filter_accept_list_reassign.o
 
+# open_transformer uses fork. Compile it only if absolutely necessary
+lib-$(CONFIG_RPM)                       += open_transformer.o
+lib-$(CONFIG_FEATURE_TAR_BZIP2)	        += open_transformer.o
+lib-$(CONFIG_FEATURE_TAR_LZMA)	        += open_transformer.o
+lib-$(CONFIG_FEATURE_TAR_GZIP)		+= open_transformer.o
+lib-$(CONFIG_FEATURE_TAR_COMPRESS)	+= open_transformer.o
+
 lib-$(CONFIG_AR)			+= get_header_ar.o unpack_ar_archive.o
 lib-$(CONFIG_BUNZIP2)			+= decompress_bunzip2.o
 lib-$(CONFIG_UNLZMA)			+= decompress_unlzma.o