diff --git a/Action.h b/Action.h
index cf0169c4..8e5cc9b6 100644
--- a/Action.h
+++ b/Action.h
@@ -37,14 +37,10 @@ typedef struct State_ {
 
 Object* Action_pickFromVector(State* st, Panel* list, int x, bool followProcess);
 
-// ----------------------------------------
-
 bool Action_setUserOnly(const char* userName, uid_t* userId);
 
 Htop_Reaction Action_setSortKey(Settings* settings, ProcessField sortKey);
 
-// ----------------------------------------
-
 Htop_Reaction Action_follow(State* st);
 
 void Action_setBindings(Htop_Action* keys);
diff --git a/Affinity.h b/Affinity.h
index 6bdd9750..52619457 100644
--- a/Affinity.h
+++ b/Affinity.h
@@ -8,14 +8,6 @@ Released under the GNU GPL, see the COPYING file
 in the source distribution for its full text.
 */
 
-#ifdef HAVE_LIBHWLOC
-#if __linux__
-#define HTOP_HWLOC_CPUBIND_FLAG HWLOC_CPUBIND_THREAD
-#else
-#define HTOP_HWLOC_CPUBIND_FLAG HWLOC_CPUBIND_PROCESS
-#endif
-#endif
-
 #include "Process.h"
 #include "ProcessList.h"
 
diff --git a/CRT.c b/CRT.c
index 2a7c7912..7776c4e7 100644
--- a/CRT.c
+++ b/CRT.c
@@ -39,10 +39,6 @@ in the source distribution for its full text.
 #define ColorPairGrayBlack ColorPair(Magenta,Magenta)
 #define ColorIndexGrayBlack ColorIndex(Magenta,Magenta)
 
-#define KEY_WHEELUP KEY_F(20)
-#define KEY_WHEELDOWN KEY_F(21)
-#define KEY_RECLICK KEY_F(22)
-
 const char *CRT_treeStrAscii[TREE_STR_COUNT] = {
    "-", // TREE_STR_HORZ
    "|", // TREE_STR_VERT
@@ -550,12 +546,7 @@ void CRT_restorePrivileges() {
 
 #else
 
-/* Turn setuid operations into NOPs */
-
-#ifndef CRT_dropPrivileges
-#define CRT_dropPrivileges()
-#define CRT_restorePrivileges()
-#endif
+// In this case, the setuid operations are defined as macros in CRT.h
 
 #endif
 
diff --git a/CRT.h b/CRT.h
index 2e21e91e..80d1eb71 100644
--- a/CRT.h
+++ b/CRT.h
@@ -7,31 +7,12 @@ Released under the GNU GPL, see the COPYING file
 in the source distribution for its full text.
 */
 
-#if HAVE_SETUID_ENABLED
-#endif
-
-#define ColorIndex(i,j) ((7-i)*8+j)
-
-#define ColorPair(i,j) COLOR_PAIR(ColorIndex(i,j))
-
-#define Black COLOR_BLACK
-#define Red COLOR_RED
-#define Green COLOR_GREEN
-#define Yellow COLOR_YELLOW
-#define Blue COLOR_BLUE
-#define Magenta COLOR_MAGENTA
-#define Cyan COLOR_CYAN
-#define White COLOR_WHITE
-
-#define ColorPairGrayBlack ColorPair(Magenta,Magenta)
-#define ColorIndexGrayBlack ColorIndex(Magenta,Magenta)
+#include <stdbool.h>
 
 #define KEY_WHEELUP KEY_F(20)
 #define KEY_WHEELDOWN KEY_F(21)
 #define KEY_RECLICK KEY_F(22)
 
-#include <stdbool.h>
-
 typedef enum TreeStr_ {
    TREE_STR_HORZ,
    TREE_STR_VERT,
@@ -158,16 +139,12 @@ extern int CRT_scrollWheelVAmount;
 
 extern char* CRT_termType;
 
-// TODO move color scheme to Settings, perhaps?
-
 extern int CRT_colorScheme;
 
 extern void *backtraceArray[128];
 
 #if HAVE_SETUID_ENABLED
 
-#define DIE(msg) do { CRT_done(); fprintf(stderr, msg); exit(1); } while(0)
-
 void CRT_dropPrivileges();
 
 void CRT_restorePrivileges();
@@ -183,8 +160,6 @@ void CRT_restorePrivileges();
 
 #endif
 
-// TODO: pass an instance of Settings instead.
-
 void CRT_init(int delay, int colorScheme, bool allowUnicode);
 
 void CRT_done();
diff --git a/ColorsPanel.h b/ColorsPanel.h
index 9977dc0b..479fad08 100644
--- a/ColorsPanel.h
+++ b/ColorsPanel.h
@@ -7,12 +7,6 @@ Released under the GNU GPL, see the COPYING file
 in the source distribution for its full text.
 */
 
-// TO ADD A NEW SCHEME:
-// * Increment the size of bool check in ColorsPanel.h
-// * Add the entry in the ColorSchemeNames array below in the file
-// * Add a define in CRT.h that matches the order of the array
-// * Add the colors in CRT_setColors
-
 #include "Panel.h"
 #include "Settings.h"
 #include "ScreenManager.h"
diff --git a/Header.c b/Header.c
index 574165a6..d2f3b884 100644
--- a/Header.c
+++ b/Header.c
@@ -16,8 +16,6 @@ in the source distribution for its full text.
 #include <string.h>
 #include <stdlib.h>
 
-#define Header_forEachColumn(this_, i_) for (int (i_)=0; (i_) < (this_)->nrColumns; ++(i_))
-
 Header* Header_new(struct ProcessList_* pl, Settings* settings, int nrColumns) {
    Header* this = xCalloc(1, sizeof(Header));
    this->columns = xCalloc(nrColumns, sizeof(Vector*));
diff --git a/IncSet.c b/IncSet.c
index 90ce8b9f..e9e28934 100644
--- a/IncSet.c
+++ b/IncSet.c
@@ -7,7 +7,6 @@ in the source distribution for its full text.
 
 #include "IncSet.h"
 #include "StringUtils.h"
-#include "Panel.h"
 #include "ListItem.h"
 #include "CRT.h"
 #include <string.h>
diff --git a/Meter.c b/Meter.c
index 34f428ff..00c49cee 100644
--- a/Meter.c
+++ b/Meter.c
@@ -11,7 +11,6 @@ in the source distribution for its full text.
 #include "Object.h"
 #include "CRT.h"
 #include "StringUtils.h"
-#include "ListItem.h"
 #include "Settings.h"
 
 #include <math.h>
@@ -19,9 +18,6 @@ in the source distribution for its full text.
 #include <stdlib.h>
 #include <stdarg.h>
 #include <assert.h>
-#include <sys/time.h>
-
-#define METER_BUFFER_LEN 256
 
 #define GRAPH_DELAY (DEFAULT_DELAY/2)
 
diff --git a/Meter.h b/Meter.h
index 773d94ff..c4d00396 100644
--- a/Meter.h
+++ b/Meter.h
@@ -7,16 +7,11 @@ Released under the GNU GPL, see the COPYING file
 in the source distribution for its full text.
 */
 
-#define METER_BUFFER_LEN 256
-
-#define GRAPH_DELAY (DEFAULT_DELAY/2)
-
-#define GRAPH_HEIGHT 4 /* Unit: rows (lines) */
-
 #include "ListItem.h"
-
 #include <sys/time.h>
 
+#define METER_BUFFER_LEN 256
+
 typedef struct Meter_ Meter;
 
 typedef void(*Meter_Init)(Meter*);
@@ -108,24 +103,8 @@ void Meter_setMode(Meter* this, int modeIndex);
 
 ListItem* Meter_toListItem(Meter* this, bool moving);
 
-/* ---------- TextMeterMode ---------- */
-
-/* ---------- BarMeterMode ---------- */
-
-/* ---------- GraphMeterMode ---------- */
-
-#ifdef HAVE_LIBNCURSESW
-#define PIXPERROW_UTF8 4
-#endif
-
-#define PIXPERROW_ASCII 2
-
-/* ---------- LEDMeterMode ---------- */
-
 extern MeterMode* Meter_modes[];
 
-/* Blank meter */
-
 extern int BlankMeter_attributes[];
 
 extern MeterClass BlankMeter_class;
diff --git a/MetersPanel.h b/MetersPanel.h
index bea9238d..c02ce1cd 100644
--- a/MetersPanel.h
+++ b/MetersPanel.h
@@ -24,14 +24,6 @@ struct MetersPanel_ {
    bool moving;
 };
 
-
-// Note: In code the meters are known to have bar/text/graph "Modes", but in UI
-// we call them "Styles".
-// We avoid UTF-8 arrows ← → here as they might display full-width on Chinese
-// terminals, breaking our aligning.
-// In <http://unicode.org/reports/tr11/>, arrows (U+2019..U+2199) are
-// considered "Ambiguous characters".
-
 void MetersPanel_setMoving(MetersPanel* this, bool moving);
 
 extern PanelClass MetersPanel_class;
diff --git a/Panel.c b/Panel.c
index 883b3e62..b77483d9 100644
--- a/Panel.c
+++ b/Panel.c
@@ -19,8 +19,6 @@ in the source distribution for its full text.
 #include <string.h>
 #include <assert.h>
 
-#define KEY_CTRL(l) ((l)-'A'+1)
-
 PanelClass Panel_class = {
    .super = {
       .extends = Class(Object),
diff --git a/Process.c b/Process.c
index e7ab4929..7a04c0f9 100644
--- a/Process.c
+++ b/Process.c
@@ -21,7 +21,6 @@ in the source distribution for its full text.
 #include <sys/resource.h>
 #include <sys/param.h>
 #include <sys/stat.h>
-#include <sys/types.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <signal.h>
@@ -37,30 +36,8 @@ in the source distribution for its full text.
 #include <sys/sysmacros.h>
 #endif
 
-#ifdef __ANDROID__
-#define SYS_ioprio_get __NR_ioprio_get
-#define SYS_ioprio_set __NR_ioprio_set
-#endif
-
-// On Linux, this works only with glibc 2.1+. On earlier versions
-// the behavior is similar to have a hardcoded page size.
-#ifndef PAGE_SIZE
-#define PAGE_SIZE ( sysconf(_SC_PAGESIZE) )
-#endif
-#define PAGE_SIZE_KB ( PAGE_SIZE / ONE_K )
-
 static int Process_getuid = -1;
 
-#define ONE_K 1024L
-#define ONE_M (ONE_K * ONE_K)
-#define ONE_G (ONE_M * ONE_K)
-#define ONE_T ((long long)ONE_G * ONE_K)
-
-#define ONE_DECIMAL_K 1000L
-#define ONE_DECIMAL_M (ONE_DECIMAL_K * ONE_DECIMAL_K)
-#define ONE_DECIMAL_G (ONE_DECIMAL_M * ONE_DECIMAL_K)
-#define ONE_DECIMAL_T ((long long)ONE_DECIMAL_G * ONE_DECIMAL_K)
-
 char Process_pidFormat[20] = "%7d ";
 
 static char Process_titleBuffer[20][20];
diff --git a/Process.h b/Process.h
index 9aca41c9..ebf5cdf4 100644
--- a/Process.h
+++ b/Process.h
@@ -8,10 +8,6 @@ Released under the GNU GPL, see the COPYING file
 in the source distribution for its full text.
 */
 
-#ifdef MAJOR_IN_MKDEV
-#elif defined(MAJOR_IN_SYSMACROS)
-#endif
-
 #ifdef __ANDROID__
 #define SYS_ioprio_get __NR_ioprio_get
 #define SYS_ioprio_set __NR_ioprio_set
diff --git a/RichString.c b/RichString.c
index 95ddf297..b97e34e5 100644
--- a/RichString.c
+++ b/RichString.c
@@ -12,8 +12,6 @@ in the source distribution for its full text.
 #include <stdlib.h>
 #include <string.h>
 
-#define RICHSTRING_MAXLEN 350
-
 #define charBytes(n) (sizeof(CharType) * (n))
 
 static void RichString_extendLen(RichString* this, int len) {
diff --git a/RichString.h b/RichString.h
index 5431e92a..e6fb4c32 100644
--- a/RichString.h
+++ b/RichString.h
@@ -7,7 +7,6 @@ Released under the GNU GPL, see the COPYING file
 in the source distribution for its full text.
 */
 
-#define RICHSTRING_MAXLEN 350
 
 #include "config.h"
 #include <ctype.h>
@@ -50,16 +49,14 @@ in the source distribution for its full text.
 #define CharType chtype
 #endif
 
+#define RICHSTRING_MAXLEN 350
+
 typedef struct RichString_ {
    int chlen;
    CharType* chptr;
    CharType chstr[RICHSTRING_MAXLEN+1];
 } RichString;
 
-#define charBytes(n) (sizeof(CharType) * (n))
-
-#define RichString_setLen(this, len) do{ if(len < RICHSTRING_MAXLEN && this->chlen < RICHSTRING_MAXLEN) { RichString_setChar(this,len,0); this->chlen=len; } else RichString_extendLen(this,len); }while(0)
-
 #ifdef HAVE_LIBNCURSESW
 
 void RichString_setAttrn(RichString* this, int attrs, int start, int finish);
diff --git a/Settings.c b/Settings.c
index 104d9bb9..c9c75d4a 100644
--- a/Settings.c
+++ b/Settings.c
@@ -17,8 +17,6 @@ in the source distribution for its full text.
 #include <string.h>
 #include <unistd.h>
 
-#define DEFAULT_DELAY 15
-
 void Settings_delete(Settings* this) {
    free(this->filename);
    free(this->fields);
diff --git a/StringUtils.c b/StringUtils.c
index 6bae8227..e2386e3c 100644
--- a/StringUtils.c
+++ b/StringUtils.c
@@ -14,12 +14,6 @@ in the source distribution for its full text.
 #include <strings.h>
 #include <stdlib.h>
 
-
-/*
- * String_startsWith gives better performance if strlen(match) can be computed
- * at compile time (e.g. when they are immutable string literals). :)
- */
-
 char* String_cat(const char* s1, const char* s2) {
    int l1 = strlen(s1);
    int l2 = strlen(s2);
diff --git a/TraceScreen.c b/TraceScreen.c
index 99b56a05..0a3485ec 100644
--- a/TraceScreen.c
+++ b/TraceScreen.c
@@ -8,7 +8,6 @@ in the source distribution for its full text.
 #include "TraceScreen.h"
 
 #include "CRT.h"
-#include "InfoScreen.h"
 #include "ProcessList.h"
 #include "ListItem.h"
 #include "IncSet.h"
diff --git a/Vector.c b/Vector.c
index e7776ea3..e51fd7b1 100644
--- a/Vector.c
+++ b/Vector.c
@@ -261,7 +261,7 @@ inline Object* Vector_get(Vector* this, int idx) {
 
 #else
 
-#define Vector_get(v_, idx_) ((v_)->array[idx_])
+// In this case, Vector_get is defined as a macro in vector.h
 
 #endif
 
@@ -274,7 +274,7 @@ inline int Vector_size(Vector* this) {
 
 #else
 
-#define Vector_size(v_) ((v_)->items)
+// In this case, Vector_size is defined as a macro in vector.h
 
 #endif
 
diff --git a/Vector.h b/Vector.h
index 32cd809e..209e27cf 100644
--- a/Vector.h
+++ b/Vector.h
@@ -72,10 +72,6 @@ int Vector_size(Vector* this);
 
 #endif
 
-/*
-
-*/
-
 void Vector_add(Vector* this, void* data_);
 
 int Vector_indexOf(Vector* this, void* search_, Object_Compare compare);