diff --git a/Makefile b/Makefile
index 00dd7f4..7f1d678 100644
--- a/Makefile
+++ b/Makefile
@@ -12,12 +12,12 @@ build_exec: profile
 build_exec_dbg:
 	@cbuild/call_task.sh build_exec_dbg 2>&1 | tee make_raw.log
 
-# recompile kerep.a in the next build task
+# recompile libkerep.a in the next build task
 rebuild_kerep: 
-	@tasks/rebuild_lib.sh kerep
-# recompile utf8proc.a in the next build task
+	@cbuild/rebuild_dep.sh libkerep.a 2>&1 | tee make_raw.log
+# recompile libutf8proc.a in the next build task
 rebuild_utf8proc: 
-	@tasks/rebuild_lib.sh utf8proc
+	@cbuild/rebuild_dep.sh libutf8proc.a 2>&1 | tee make_raw.log
 
 rebuild_all: rebuild_kerep rebuild_utf8proc
 
@@ -45,7 +45,14 @@ profile:
 # uses gprof2dot python script to generate function call tree  
 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 d49a3e4..b4fea16 100644
--- a/default.config
+++ b/default.config
@@ -1,6 +1,6 @@
 #!/bin/bash
-CBUILD_VERSION=6
-CONFIG_VERSION=3
+CBUILD_VERSION=7
+CONFIG_VERSION=4
 
 PROJECT="scolte"
 CMP_C="gcc"
@@ -14,6 +14,17 @@ 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="$DEPS
+#         dependency_dir='...'"
+DEPS="kerep='build_static_lib   bin  libkerep.a'
+      utf8proc='libutf8proc.a   .    libutf8proc.a'"
+
 # OBJDIR structure:
 #  ├── objects/  - dir where compiled *.o files are stored. cleans every call of build task
 #  ├── profile/  - dir where gcc *.gcda profiling info files stored
@@ -47,7 +58,6 @@ case "$TASK" in
         LINKER_ARGS="$CPP_ARGS"
         PRE_TASK_SCRIPT=tasks/pre_build.sh
         TASK_SCRIPT=cbuild/default_tasks/build_exec.sh
-        DEPS_BUILD_TASK=build_static_lib
         ;;
     # creates executable with debug info and no optimizations
     build_exec_dbg)
@@ -56,7 +66,8 @@ case "$TASK" in
         LINKER_ARGS="$CPP_ARGS"
         PRE_TASK_SCRIPT=tasks/pre_build.sh
         TASK_SCRIPT=cbuild/default_tasks/build_exec.sh
-        DEPS_BUILD_TASK=build_static_lib_dbg
+        DEPS="$DEPS
+            kerep='build_static_lib_dbg bin libkerep.a'"
         ;;
     # executes $EXEC_FILE
     exec)
@@ -64,7 +75,7 @@ case "$TASK" in
         ;;
      # executes $EXEC_FILE with valgrind memory checker
     valgrind)  
-        VALGRIND_ARGS="-s --read-var-info=yes --track-origins=yes --fullpath-after=$PROJECT/ --leak-check=full --show-leak-kinds=all"
+        VALGRIND_ARGS="-s --read-var-info=yes --track-origins=yes --fullpath-after=$PROJECT/ --leak-check=full --show-leak-kinds=all" 
         TASK_SCRIPT=cbuild/default_tasks/valgrind.sh
         ;;
     # generates profiling info
@@ -96,6 +107,20 @@ case "$TASK" in
         TASK_SCRIPT=cbuild/default_tasks/build_exec.sh
         POST_TASK_SCRIPT=cbuild/default_tasks/gprof.sh
         ;;
+    # 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"
@@ -111,6 +136,9 @@ case "$TASK" in
         TASK_SCRIPT=cbuild/default_tasks/clean.sh
         POST_TASK_SCRIPT=tasks/clean_additions.sh
         ;;
+    # nothing to do
+    no_task)
+        ;;
     # unknown task
     *)
         error "task <$TASK> not found"
diff --git a/tasks/clean_additions.sh b/tasks/clean_additions.sh
index 3b4ee55..45bb270 100644
--- a/tasks/clean_additions.sh
+++ b/tasks/clean_additions.sh
@@ -1,14 +1,4 @@
 #!/usr/bin/bash
 set -eo pipefail
 
-for tmpfile in $(ls -a | grep -e '\.rebuild.*\.tmp'); do
-    try_delete_dir_or_file "$tmpfile"
-done
-
-for submodule in kerep utf8proc; do
-    cd "$submodule"
-    make clean
-    cd ..
-done
-
 try_delete_dir_or_file src/generated
diff --git a/tasks/pre_build.sh b/tasks/pre_build.sh
index b193cea..eca2fa2 100644
--- a/tasks/pre_build.sh
+++ b/tasks/pre_build.sh
@@ -1,28 +1,5 @@
 #!/bin/bash
 set -eo pipefail
 
-# if $lib_project.a doesn't exist or rebuild_* task was executed, builds static lib
-function handle_static_dependency {
-    local lib_project="$1"
-    local lib_build_task="$2"
-    local lib_build_rezults="$3"
-    if [ ! -f "$OBJDIR/libs/$lib_project.a" ] || [ -f .rebuild_$lib_project.tmp ]; then
-        [[ -z "$lib_build_task" ]] && error "lib_build_task is empty" 
-        myprint "${BLUE}making $lib_project task <$lib_build_task>"
-
-        cd $lib_project
-        if ! make "$lib_build_task"; then
-            exit 1
-        fi
-        cd ..
-
-        cp $lib_build_rezults $OBJDIR/libs/
-        myprint "${GREEN}copied ${CYAN}$lib_project.a"
-        rm -f .rebuild_$lib_project.tmp
-    fi
-}
-
-handle_static_dependency kerep "$DEPS_BUILD_TASK" kerep/bin/kerep.a
-handle_static_dependency utf8proc libutf8proc.a utf8proc/libutf8proc.a
-
+# generate source code for views/*.tui.dtsod
 source tasks/build_view.sh
diff --git a/tasks/rebuild_lib.sh b/tasks/rebuild_lib.sh
deleted file mode 100644
index 407ec56..0000000
--- a/tasks/rebuild_lib.sh
+++ /dev/null
@@ -1,8 +0,0 @@
-#!/bin/bash
-set -eo pipefail
-
-source cbuild/colors.sh
-source cbuild/functions.sh
-touch ".rebuild_$1.tmp"
-rm -fv "obj/libs/$1.a"
-myprint "${YELLOW}$1.a will be rebuilt in the next build task"