diff --git a/Makefile b/Makefile
index 0bd17cd..3f0f054 100644
--- a/Makefile
+++ b/Makefile
@@ -49,10 +49,18 @@ profile:
 	@cbuild/call_task.sh profile 2>&1 | tee make_raw.log
 
 # compiles program with -pg and runs it with gprof
-# uses gprof2dot python script to generate function call tree  
+# uses gprof2dot python script to generate function call tree (pip install gprof2dot)
+# requires graphviz (https://www.graphviz.org/download/source/)
 gprof:
 	@cbuild/call_task.sh gprof 2>&1 | tee make_raw.log
-	
+
+# compiles program and runs it with callgrind (part of valgrind)
+# uses gprof2dot python script to generate function call tree (pip install gprof2dot)
+# requires graphviz (https://www.graphviz.org/download/source/)
+# P.S. detailed rezults can be viewed in KCacheGrind
+callgrind:
+	@cbuild/call_task.sh callgrind 2>&1 | tee make_raw.log
+
 # compiles executable with sanitizers and executes it to find errors and warnings
 sanitize:
 	@cbuild/call_task.sh sanitize 2>&1 | tee make_raw.log
diff --git a/cbuild b/cbuild
index 5e23ef8..ef6a3f8 160000
--- a/cbuild
+++ b/cbuild
@@ -1 +1 @@
-Subproject commit 5e23ef8156a85a981d60152990bde53d6e8eefe9
+Subproject commit ef6a3f82c429ec232e1b910eecbdece76de933b3
diff --git a/default.config b/default.config
index 6ef5ff7..913fe59 100644
--- a/default.config
+++ b/default.config
@@ -1,6 +1,6 @@
 #!/bin/bash
-CBUILD_VERSION=6
-CONFIG_VERSION=6
+CBUILD_VERSION=7
+CONFIG_VERSION=7
 
 PROJECT="kerep"
 CMP_C="gcc"
@@ -14,13 +14,23 @@ SRC_CPP="$(  find src -name '*.cpp')"
 TESTS_C="$(  find tests -name '*.c')"
 TESTS_CPP="$(find tests -name '*.cpp')"
 
+# dir with dependeicy dirs
+DEPS_BASEDIR="."
+# EXAMPLE: "dependency_dir='build_task out_dir lib_file'
+#            other_depndency_dir=..."
+# Dependencies must be declared on separate lines
+# Values can be override by resetting one of dependencies:
+#   DEPS="$DEPS
+#         dependency_dir='...'"
+DEPS=""
+
 # OBJDIR structure:
 #  ├── objects/  - dir where compiled *.o files are stored. cleans every call of build task
 #  ├── profile/  - dir where gcc *.gcda profiling info files stored
 #  └── libs/     - there you can put static libs and linker will find them
 OBJDIR="obj"
 OUTDIR="bin"
-STATIC_LIB_FILE="$PROJECT.a"
+STATIC_LIB_FILE="lib$PROJECT.a"
 
 # OS-specific options
 case "$OS" in
@@ -135,6 +145,20 @@ case "$TASK" in
         TASK_SCRIPT=cbuild/default_tasks/gprof.sh
         POST_TASK_SCRIPT=
         ;;
+    # compiles program and runs it with callgrind (part of valgrind)
+    # uses gprof2dot python script to generate function call tree (pip install gprof2dot)
+    # requires graphviz (https://www.graphviz.org/download/source/)
+    # P.S. detailed rezults can be viewed in KCacheGrind
+    callgrind)
+        OUTDIR="$OUTDIR/callgrind"
+        # -pg adds code to executable, that generates file containing function call info (gmon.out)
+        C_ARGS="-O2 -flto=auto -fuse-linker-plugin"
+        CPP_ARGS="$C_ARGS"
+        LINKER_ARGS="$CPP_ARGS"
+        PRE_TASK_SCRIPT=tasks/pre_build.sh
+        TASK_SCRIPT=cbuild/default_tasks/build_exec.sh
+        POST_TASK_SCRIPT=cbuild/default_tasks/callgrind.sh
+        ;;
     # compiles executable with sanitizers and executes it to find errors and warnings
     sanitize)
         OUTDIR="$OUTDIR/sanitize"
@@ -149,6 +173,9 @@ case "$TASK" in
     clean)
         TASK_SCRIPT=cbuild/default_tasks/clean.sh
         ;;
+    # nothing to do
+    no_task)
+        ;;
     # unknown task
     *)
         error "task <$TASK> not found"